Limestone can be reconstituted into large, hard blocks visually similar to natural stone using materials and temperatures available to ancient builders.

Modern geopolymer chemistry plus demonstration blocks establish feasibility at some scale; ancient-condition fidelity unproven.

Modern laboratory chemistry and physical demonstration blocks prove that artificial limestone can be synthesized using materials broadly available in antiquity. This establishes the mechanical plausibility of the process. The strongest opposing consideration is that modern demonstrations utilizing contemporary quality control do not prove ancient builders successfully executed or adopted these recipes at a monumental scale.

Modern geopolymer chemistry and related lime–pozzolan systems are well established, and feasibility work (GEO‑E013, GEO‑E022) shows that large, strong blocks of reconstituted stone can be produced with mineral inputs, lime, and siliceous additives at modest temperatures, all compatible with ancient technology. This demonstrates that making visually convincing artificial limestone is chemically and technically realistic in principle. The main limitation is that none of the demonstration blocks has been subjected to a blind, side‑by‑side petrographic comparison with quarry and monument stone, so exact similarity in microstructure and trace phases is unproven. The strongest opposing consideration is this gap between modern lab feasibility using optimized recipes and proof that any ancient builders actually matched monument‑grade material in practice.

Modern geopolymer chemistry is established science, Sierra et al. 2010 show that lime plus diatomaceous earth forms a C–S–H binder at room temperature, and the Geopolymer Institute reports multi-ton demonstration blocks. That package is enough to open the door: convincing artificial limestone can be made with inputs that are not obviously beyond a Bronze Age toolkit. The strongest opposing consideration is that the demonstrations use modern knowledge and process control, and no demonstration block has been independently analyzed against monument and quarry stone under blind conditions, so fidelity — not possibility — remains open.

The feasibility claim as stated — convincing artificial limestone from ancient-available materials and temperatures — is backed by established chemistry (GEO-E022 demonstrates C–S–H gel formation from lime and diatomaceous earth at room temperature) and by self-reported multi-ton demonstration blocks (GEO-E013). Per the assessment rules, part of this verdict leans on general scientific background: alkali-activated and pozzolanic materials are a mature industrial field, which calibrates plausibility beyond what the evidence records alone show. The strongest opposing consideration is that no demonstration block has been independently analyzed and blind-compared against monument stone, and modern production knowledge does not establish ancient production — the gap between "can be made" and "was made, indistinguishably, at monument scale" is exactly what remains unproven. As a mechanism-rung claim, provisionally_supported is warranted.

The evidence records themselves are thin — a self-reported multi-ton demonstration block from the proponent organization (GEO-E013) and a laboratory demonstration that lime plus diatomaceous earth forms C–S–H gel at room temperature (GEO-E022, which contains no blocks and no archaeology). My verdict therefore leans partly on general background: geopolymer and lime-pozzolan chemistry are established science, and Roman-era hydraulic concretes show ancient societies could bind mineral aggregate at scale. The strongest opposing consideration is that no demonstration block has ever been independently analysed and compared to monument stone, so "visually similar to natural stone" under close petrographic examination — the property that actually matters for the attribution rung — remains unverified.

GEO-E022 adds a peer-reviewed demonstration that a C–S–H binder forms at room temperature from lime and diatomaceous earth, strengthening feasibility alongside the proponent demonstration blocks (GEO-E013). Feasibility is not occurrence, and ancient-condition fidelity at scale remains unproven.

Unchanged: GEO-E022 shows a C-S-H binder forms at room temperature from lime and diatomaceous earth, and GEO-E013 reports proponent demonstration blocks. Feasibility is not occurrence, and no independent analysis of a demonstration block exists.

GEO-E022 shows a C–S–H binder forms from lime and diatomaceous earth at room temperature, and GEO-E013 reports large demonstration blocks; GEO-E020's positive control incidentally confirms sizeable cast limestone blocks exist. The claim asserts visual similarity and ancient-feasible inputs, not analytical indistinguishability — and feasibility is not occurrence.

Modern materials science (Sierra 2010) and Geopolymer Institute demonstrations confirm artificial limestone can be synthesized using ancient-accessible materials. The strongest opposing consideration is that demonstrating chemical feasibility with modern quality control does not prove ancient builders actually formulated, scaled, or utilized these specific recipes.

Modern geopolymer science and demonstration blocks produced by proponents (GEO-E013), alongside materials-science work showing lime–diatomaceous-earth systems yielding C–S–H binders (GEO-E022), collectively indicate that large, hard, limestone-like blocks can be produced from plausible mineral inputs at modest temperatures. However, these demonstrations use contemporary knowledge, equipment, and quality control, and no independent blind comparison between such reconstituted blocks and monument stone has yet been run. The strongest opposing consideration is that feasibility in principle does not guarantee that an ancient, practically workable recipe existed or that it would yield microstructures indistinguishable from those of candidate monuments.

Geopolymer chemistry is established science, Sierra 2010 shows a C–S–H binder forming from lime and diatomaceous earth at room temperature, and the Geopolymer Institute reports multi-ton demonstration blocks, so the narrow feasibility claim — that convincing artificial limestone can be made at all — is in decent shape. What remains open is whether ancient-feasible recipes, without modern quality control, produce stone that matches monument blocks under close analysis, and no demonstration block has been independently compared to quarry and monument stone under blind conditions. The strongest opposing consideration is that modern know-how and tools are doing work the claim attributes to Bronze Age inputs, so visual similarity of a modern pour is not a period process proof.

As a possibility claim it is in decent shape: alkali-activated geopolymer chemistry is established modern materials science, the Geopolymer Institute reports multi-ton demonstration blocks (GEO-E013), and Sierra et al. 2010 showed a lime and diatomaceous-earth C–S–H binder forming at room temperature (GEO-E022). This verdict leans partly on general scientific background rather than the records alone, since the demonstration-block record is self-reported by the proponent organization. What remains unproven is fidelity and antiquity: no demonstration block has been independently analyzed against monument stone under blind conditions, and all demonstrations use modern knowledge and quality control, which is the strongest opposing consideration. Even fully successful feasibility would establish nothing about occurrence, but as stated the claim only asserts that convincing artificial limestone can be made with ancient-feasible inputs, and current evidence supports that provisionally.

Lime-pozzolan chemistry forming a C–S–H binder from diatomaceous earth at ambient temperature is demonstrated in a peer-reviewed materials paper (GEO-E022), and multi-ton demonstration blocks are reported, though only by the proponent organization (GEO-E013). Background knowledge of ancient lime plasters and mortars raises the prior that binder chemistry was within reach, and I flag that this verdict leans partly on that background rather than on the file's records alone. The strongest opposing consideration is the "visually similar to natural stone" component: Jana's control geopolymeric limestone was readily separable from natural limestone by matrix texture, spherical air voids, and Na/Al enrichment, so fidelity under analysis — the property that would matter for attribution — is not established, and no demonstration block has been independently characterized against monument stone.

GEO-E022 shows C-S-H forms from lime and diatomaceous earth at room temperature and GEO-E013 reports large demonstration blocks. Opus's point from GEO-E020 shows cast stone is analytically distinguishable, but the claim asserts visual similarity and ancient-feasible materials, not analytical indistinguishability. Feasibility, not occurrence.

GEO-E022 shows a C–S–H binder forms from lime and diatomaceous earth at room temperature, and GEO-E013 reports large demonstration blocks. The claim asserts visual similarity and ancient-feasible materials, not analytical indistinguishability — GEO-E020's control in fact confirms large cast blocks are producible.

Materials science research demonstrates that calcium-silicate-hydrate (C-S-H) and carbonate binders can be synthesized at room temperature using lime, diatomaceous earth, or alkali activators available in antiquity (Sierra et al. 2010). Experimental blocks produced by proponents demonstrate that reconstituted limestone can visually and mechanically mimic natural building stone. Strongest opposing consideration: Translating laboratory-scale chemical synthesis to multi-ton monolith production without modern mechanical mixing and quality control poses severe rheological and cracking challenges that experimental blocks have not fully resolved at scale.

Sierra 2010 establishes C–S–H binder formation from lime and diatomaceous earth at room temperature, and the Geopolymer Institute reports multi-ton demonstration blocks; the chemistry is genuinely ancient-feasible. The strongest opposing consideration is that the demonstration blocks are self-reported with no independent analysis, and scale feasibility — especially the natron route at pyramid volume — is expressly untested (GEO-C519). Feasibility is supported; occurrence is a separate question this claim correctly does not make.

The chemistry (natron + lime → CaCO₃ + NaOH; lime + diatomaceous earth → C–S–H) is feasible, and a multi-ton demonstration block is self-reported. The strongest opposing consideration is that no independent analysis of any demonstration block exists (GEO-E013's own limitation), and GEO-E022 establishes feasibility without any archaeological occurrence.

GEO-E013 reports production of large re-agglomerated limestone demonstration blocks, and GEO-E022 establishes room-temperature formation of a calcium-silicate cementing phase from lime and diatomaceous earth. GEO-E010 and the general chemical plausibility of mineral binders support ancient material availability, but this part of the judgment relies partly on ordinary materials-science priors rather than archaeological evidence. The strongest opposing consideration is that the large-block demonstration is self-reported and has not received independent compositional or performance testing.

GEO-E013 reports production of large re-agglomerated limestone blocks, while GEO-E022 establishes that lime and diatomaceous earth can form a calcium-silicate hydrate binder at room temperature. These records make the general mechanism plausible but do not independently characterize the large demonstration block or establish that every input and process was ancient-feasible at construction scale. GEO-E012 concerns disputed archaeological occurrence rather than a controlled feasibility trial. The strongest opposing consideration is the absence of an independent, fully documented large-block replication using only specified ancient materials and operations.

The claim is feasibility (“can be reconstituted”), not ancient use. Davidovits demonstration blocks, Sierra et al. 2010 lime–diatomaceous- earth C–S–H at room temperature, and the broader alkali-silicate/ geopolymer materials literature establish that hard, visually stone-like limestone composites are chemically achievable with natron, lime, plant ash, and silica sources. Ancient scale and fuel budgets are less tested (see GEO-C010/C011). Strongest opposing consideration: modern lab and workshop success does not prove Old Kingdom industrial production, and full multi-ton outdoor replications under strictly pre-industrial constraints remain sparse on this ledger.

Laboratory demonstrations of re-agglomerated limestone blocks and room-temperature C–S–H formation from lime plus diatomaceous earth establish chemical feasibility with materials available in principle; ancient scale, durability matching, and visual identity for multi-ton monuments are unproven. Strongest opposing consideration is that modern demos with contemporary knowledge do not establish ancient industrial practice or the specific recipes' sufficiency at pyramid volumes.

Lime-pozzolan and alkali-activation chemistry are uncontroversial, and Sierra 2010 shows a C–S–H binder forming from diatomaceous earth and lime at room temperature; general cement-science background (Roman concrete, millennia of lime mortar) does much of the work here and I say so explicitly. What the ledger does not contain is any independently analysed multi-ton demonstration block, so "large, hard, and visually similar to natural stone" is asserted by the proponent organisation rather than shown. The strongest opposing consideration is that visual similarity at the scale and finish of pyramid casing stone is the untested part, and it is exactly the part the attribution claims need.

Chemically this is the least exotic claim in the case: lime mortars, Roman pozzolanic concrete and cast stone are uncontroversial technologies, and GEO-E022 demonstrates a C–S–H binder forming from lime and diatomaceous earth at room temperature. Part of this verdict leans on general materials-science priors rather than the ledger, which offers only self-reported proponent demonstration blocks (GEO-E013) for the "large blocks visually similar to natural stone" portion. The strongest opposing consideration is that no independent party has analysed a demonstration block to confirm it would pass as natural stone under the petrographic tests applied to the pyramids.

GEO-E013 reports multi-ton demonstration blocks (self-reported, never independently analysed). GEO-E022 shows lime plus diatomaceous earth forms a C–S–H binder at room temperature. GEO-E012 is entered as support but its bearing is on occurrence, not feasibility. Indirectly, the genuine geopolymer limestone analysed in GEO-E020 is a real artificial limestone. Visual similarity to natural stone at monument scale has not been independently demonstrated.

GEO-E013 (weak, self-reported multi-ton blocks, never independently analysed), GEO-E022 (room-temperature C–S–H from lime and diatomaceous earth; feasibility only), and indirectly GEO-E020, whose positive control is a real artificial limestone. Whether 'visually similar' holds under scrutiny is exactly what GEO-E020 undercut: the artificial block was distinguishable under the microscope. Provisional because the demonstration blocks are self-reported and the ancient-conditions constraint has not been independently verified.

Modern geopolymer chemistry is established science, and proponent demonstration blocks exist; what is unproven is that the specific ancient-feasible recipes produce stone that matches monument blocks under close analysis.

Pre-industrial chemical pathways for reconstituting calcium carbonates and silicates (such as pozzolanic reactions between lime and diatomaceous earth or natron-activated slurries) have been demonstrated experimentally at room temperature (Sierra et al. 2010) and produced in multi-ton demonstration blocks by the Geopolymer Institute. The basic material-science feasibility of forming hard synthetic stone from ancient reagents is well founded. The strongest opposing consideration is that large-scale field casting without cracking, differential shrinkage, or rapid atmospheric carbonation failure lacks rigorous documentation under ancient Egyptian environmental conditions.

Chemical and materials feasibility has been demonstrated experimentally: ambient-temperature formulations of lime, pozzolans, or diatomaceous earth readily form coherent C-S-H binders (GEO-E022), and large reconstituted limestone blocks have been physically synthesized by proponents (GEO-E013). The underlying mineral chemistry does not exceed ancient technical capabilities. The strongest opposing consideration is that producing multi-ton crack-free blocks without modern hydraulic cements poses severe rheological, setting, and drying shrinkage challenges at scale.

Materials science research demonstrates that calcium-silicate-hydrate (C-S-H) gels and alkali-activated binders can be formulated at room temperature using lime, diatomaceous earth, or natron, producing hardened stone-like composites visually resembling limestone. Sierra et al. (2010) confirmed the chemical feasibility of ambient C-S-H formation from ancient-accessible inputs. The strongest opposing consideration is that achieving structural integrity in multi-ton monoliths without modern quality control or curing additives remains unverified outside of self-reported proponent demonstrations.

Materials science demonstrations, including Sierra et al. (2010) and experimental geopolymer formulations, confirm that mixing calcium sources with reactive silicates or alkalis at ambient or mildly elevated temperatures can synthesize durable, stone-like cementitious materials. The chemical reaction pathways (e.g., lime-pozzolan C-S-H formation or alkali-activated aluminosilicate geopolymerization) do not require high-temperature kilns and utilize widely available raw materials. The strongest opposing consideration is that producing multi-ton monolithic blocks without extensive shrinkage cracking, hydration failures, or massive fuel/reagent footprints remains experimentally unproven at full archaeological scale.

Feasibility has genuine support: Sierra 2010 shows lime plus diatomaceous earth forms a C–S–H binder at room temperature, and the Geopolymer Institute reports multi-ton demonstration blocks — but the latter is self-reported with no independent analysis, and the natron route's feasibility at construction scale is expressly untested (GEO-C519). The claim is about capability, and the demonstration gap between a lab binder and large, hard, visually natural blocks produced with ancient means is real. Feasibility is not occurrence.

Feasibility is genuinely demonstrated in pieces: Davidovits' multi-ton demonstration block (self-reported), and Sierra et al. 2010 showing a lime + diatomaceous earth C–S-H binder forms at room temperature from plausibly ancient materials. The gap is that feasibility is not occurrence — no independent analysis of any demonstration block exists, the natron route's large-scale feasibility is expressly untested, and modern production knowledge does not establish ancient production.

Feasibility is genuinely demonstrated in fragments: Sierra 2010 (GEO-E022) shows lime + diatomaceous earth forms a C–S–H binder at room temperature, and the Geopolymer Institute reports multi-ton demonstration blocks (GEO-E013) — but the blocks are self-reported and never independently analyzed, and scale-up to "large, hard, visually similar" blocks by ancient crews is untested. Feasibility is not occurrence; the claim is plausible and partly demonstrated but not established.

Sierra 2010 (GEO-E022) establishes that lime plus diatomaceous earth forms a C–S–H binder at room temperature from plausibly ancient-available materials, and the Geopolymer Institute reports multi-ton demonstration blocks (GEO-E013); reconstituted limestone is chemically feasible. The strongest opposing consideration is that the demonstrations are self-reported, never independently analyzed, and modern production knowledge does not establish ancient production — feasibility is not occurrence, and no independent lab has replicated a visually convincing large block from the proposed recipes.

GEO-E013 reports production of large re-agglomerated limestone blocks, while GEO-E022 demonstrates room-temperature formation of a C-S-H binder from lime and diatomaceous earth. These records establish chemical plausibility but do not provide independent characterization of a large demonstration block made through a fully specified ancient-feasible process. The strongest opposing consideration is the absence of independent replication, durability testing, and evidence that the required process scales under ancient production constraints.

GEO-E013 reports production of large re-agglomerated limestone blocks, while GEO-E022 demonstrates room-temperature formation of a calcium-silicate cementing phase from lime and diatomaceous earth. General cement chemistry also makes mineral reconstitution plausible, so this verdict relies partly on scientific priors rather than solely on the archaeological records. The strongest opposing consideration is the absence of independent testing of a large demonstration block made under strictly ancient-compatible conditions.

GEO-E013 reports production of large demonstration blocks, and GEO-E022 establishes that lime and diatomaceous earth can form a calcium-silicate-hydrate binder at room temperature. Together they make reconstitution chemically plausible, but the large-block result is self-reported and lacks independent strength, durability, compositional, and process verification. The strongest opposing consideration is the absence of an independently replicated monument-scale block made under prespecified ancient-material and ancient-process constraints.

GEO-E013 reports large demonstration blocks, while GEO-E022 independently establishes that lime and diatomaceous earth can form a C-S-H cementing phase at room temperature. These records make production of some stone-like limestone composites plausible, but the large blocks are self-reported and lack independent mechanical or compositional characterization. The strongest opposing consideration is the absence of a replicated ancient-input process demonstrating monumental scale, durability, and close resemblance to the relevant natural limestone.

Davidovits-group demonstration blocks, Sierra et al. room-temperature lime-diatomaceous-earth C–S–H formation, and the chemical availability of natron plus achievable temperatures establish that reconstituted limestone visually and mechanically similar to natural stone can be produced with ancient-accessible inputs. Scale and durability under pyramid conditions remain unproven, but the claim is only "can be". Strongest opposing consideration is that modern lab or yard demos do not prove ancient industrial practice.

Davidovits demonstration blocks, Barsoum-group lime-plus-diatomaceous- earth C–S–H gels, and related room-temperature syntheses establish that hard, visually stone-like limestone can be reconstituted with materials and temperatures accessible to ancient builders. Scale-up and durability under monument loads remain untested in the ledger. Strongest opposing consideration is that laboratory feasibility is not occurrence in the archaeological record.

Geopolymer Institute demonstration blocks and Sierra et al. 2010 lime plus diatomaceous earth C–S–H work show reconstituted limestone-like material is chemically achievable with ingredients and ambient or modest temperatures. Barsoum-group feasibility is real; ancient scale, fuel budgets, and exact recipes remain unproven as historical practice. Strongest opposing consideration is that modern lab or yard demos do not establish that ancient builders produced multi-ton architectural stone this way.

Demonstration re-agglomerated limestone blocks, room-temperature lime– diatomaceous-earth C–S–H formation, and related geopolymer recipes show that hard, stone-like limestone composites are chemically feasible with materials and temperatures argued to be anciently available. Strongest opposing consideration is that modern lab or institute demos do not establish ancient production at monument scale, fuel budgets, or durability under the exact proposed recipes without independent analysis of demonstration products.

Cement science makes the chemistry unremarkable — lime-pozzolan C–S–H forms at room temperature (GEO-E022) and alkali-silicate binders set with carbonate aggregate — so I rate this largely on background rather than on the ledger, which offers only self-reported demonstration blocks (GEO-E013) with no independent analysis. The demanding words are "large" and "visually similar to natural stone": nobody in this record has independently examined a multi-ton proponent block or shown that a cast block passes petrographic inspection as natural. The strongest opposing consideration is GEO-E020, which found a real Davidovits geopolymeric limestone readily distinguishable from natural limestone in texture and binder chemistry — i.e. the visual-similarity component may be false even if the making is easy.

Reconstituting carbonate aggregate with a lime-pozzolan or alkali binder is uncontroversial cement science, and Sierra et al. show a C–S–H gel forming at room temperature from lime and diatomaceous earth — materials plausibly available in Egypt. This verdict leans partly on general materials-science background rather than on the ledger's records, since the only direct demonstration of large blocks is the proponent organisation's self-report with no independent analysis. The strongest opposing consideration is the untested part of the claim: "large" and "visually similar to natural stone" at monument scale, with ancient-available reagent quantities, has never been demonstrated under third-party observation.

That a lime- or alkali-bound limestone composite can be made from ancient-accessible inputs is well grounded: GEO-E022 shows C–S–H gel forming from lime and diatomaceous earth at room temperature, and background knowledge (lime mortar, Roman concrete, Coade stone) makes the chemistry unremarkable — I flag that part of this rests on priors. The demanding part — large blocks visually indistinguishable from natural stone — is carried only by the proponent organisation's self-report (GEO-E013), never independently analysed. The strongest opposing consideration is Jana's finding that a genuine Davidovits geopolymeric limestone was texturally distinct from natural limestone at the microscale.

The binder chemistry is demonstrated: Sierra et al. show lime plus diatomaceous earth forming a C–S–H gel at room temperature with materials plausibly available in Egypt, and lime-based artificial stone is uncontroversial materials science. What remains unsupported is the rest of the claim — "large", "hard" and "visually similar to natural stone" rest on the Geopolymer Institute's self-reported multi-ton demonstration blocks, which no independent party has analysed. The strongest opposing consideration is Jana's positive control, which found that a genuine Davidovits geopolymeric limestone is texturally and chemically distinguishable from natural limestone at a glance under the microscope — i.e. the visual-similarity clause may fail even where the chemistry works, and in any case feasibility is not occurrence.

A real artificial limestone exists in the record — the geopolymer block GEO-E020 used as its positive control — and GEO-E022 shows the C–S–H chemistry forms at room temperature from lime and diatomaceous earth. GEO-E013's multi-ton demonstration blocks are self-reported and never independently analysed, so the 'large' and 'ancient inputs only' components rest on proponent report. GEO-E012 concerns disputed monument samples and is not a feasibility trial.

GEO-E013 (self-reported demonstration blocks), GEO-E022 (lime plus diatomaceous earth forms C–S–H at room temperature), and GEO-E020's use of a genuine Davidovits geopolymeric limestone as a positive control together show artificial limestone can be made; GEO-E012 shows the features proponents attribute to it exist somewhere. No independent analysis of a demonstration block exists, and 'large' has been shown only by self-report.

GEO-E022 shows lime and diatomaceous earth form a C–S–H cement at room temperature. GEO-E013 reports multi-ton demonstration blocks, self-reported and never independently analysed. GEO-E012 reports pyramid features read as reconstituted limestone, but their diagnosticity is disputed. The chemistry is shown to work; block-scale production with ancient inputs rests mainly on the proponents' own report, so the verdict is provisional.

Reconstituted limestone demonstrably can be made — Jana analyzed a real Davidovits geopolymeric block, and the Institute reports multi-ton demonstration blocks — and lime-pozzolan C–S–H chemistry is feasible at room temperature. But the demonstration blocks are self-reported with no independent analysis, Jana's observations question visual similarity (smooth matrix, spherical voids), and production at pyramid scale with ancient inputs and temperatures remains untested. Feasibility is supported; occurrence is not this claim's burden.

GEO-E013 reports production of large demonstration blocks, and GEO-E022 shows that lime and diatomaceous earth can form a C-S-H cement at room temperature. Together they make reconstitution chemically plausible, but the large-block result is self-reported and lacks independent mechanical or compositional analysis under a documented ancient-feasible protocol. The strongest opposing consideration is that direct examinations of pyramid samples generally find natural limestone rather than the predicted manufactured fabric, though occurrence and feasibility are distinct questions.

Demonstration blocks (GEO-E013) and room-temperature lime–diatomaceous-earth C–S–H formation (GEO-E022) establish laboratory feasibility with anciently available materials; natron chemistry is chemically coherent. No ancient block has been shown to match, and scale/fuel questions remain open. Strongest opposing consideration is that modern success does not prove ancient practice.

Direct evidence is thin. There is a self-reported multi-ton demonstration block with no published independent analysis (GEO-E013). There is also a laboratory result that lime, diatomaceous earth and water form a C–S–H cement at room temperature (GEO-E022), which shows a binder route but not large, hard, natural-looking blocks. GEO-E012 cannot support feasibility without assuming its own conclusion. Jana's positive control (GEO-E020) confirms that Davidovits-made geopolymeric limestone exists, but also shows it is distinguishable from natural stone by microscopy and microanalysis, and the ancient availability of its recipe is not documented. On general background, lime-bound artificial stone is chemically unremarkable, so the claim is plausible, and that prior rather than the ledger supplies most of my credence; strongest opposing consideration: no hardness, durability or visual-match measurement of any block made from demonstrably ancient inputs appears in the record.

GEO-E013 reports multi-ton demonstration blocks but is self-reported and never independently analysed. GEO-E022 shows lime and diatomaceous earth form a calcium-silicate gel at room temperature, which bears on feasibility only. GEO-E012 is attached here too but concerns pyramid samples, not feasibility. Feasibility is plausible; it is not evidence of ancient use.