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Cast, Not Carved · source record · paper

Natural origin of casing stone from the pyramid of Cheops

Freestone, I. C.; Middleton, A. P. · 2007

AI-verified citationSRC-FREESTONE-MIDDLETON-2007
identifier / locator
Proceedings of the 29th Annual Meeting of the International Cement Microscopy Association (ICMA), Quebec City, May 20–24, 2007, pp. 289–292 (pagination from Freestone's own author-supplied citation on Academia.edu; not confirmed against the proceedings volume). No DOI (conference proceedings).
verification note
Verified by an AI agent (2026-08-22 run) via the author's Academia.edu record; abstract and key findings read. Correction recorded: this paper circulates misattributed as 'Middleton & Bradley' (including in this project's earlier research notes) — Middleton & Bradley 1988/1989 are different papers on Egyptian sculpture. The authors here are Freestone & Middleton.
reliability notes
  • Independent of the Barsoum, Jana, and Davidovits groups; sample is a British Museum casing-stone fragment (re-examination of BM report 5084, 1984).
  • Four-page proceedings paper on a single museum fragment; the authors themselves flag sampling adequacy as a limit.

Evidence drawn from this source

Undermines· moderateGEO-E021

Multi-technique analysis of a British Museum Cheops casing fragment: natural limestone (Freestone & Middleton)

what the source states
Polarised light microscopy, SEM, energy-dispersive X-ray microanalysis, XRD, and infrared spectroscopy of a casing stone from the pyramid of Cheops indicate "a natural limestone. There are no features which support the artificial, geopolymeric origin advocated by Davidovits and co-workers." Composition ~2 mol% MgCO₃, 4–5% SiO₂, ~7% insoluble residue; cristobalite present as opal-CT, consistent with natural sedimentary processes; no air bubbles, organic fibers, or crushed-and-reaggregated texture.
what we infer
Independent of the Barsoum, Jana, and Davidovits groups. The opal-CT identification directly counters Davidovits' 1986 use of cristobalite as a synthetic marker. Attribution note: this paper circulates misattributed as "Middleton & Bradley" — the correction is recorded on the source record.
limitations
  • A single museum fragment; the authors themselves flag sampling adequacy against possible heterogeneity of the casing stones.
  • Four-page proceedings paper, not journal peer review.
  • Proponent response to this line of criticism: the methods critique (GEO-C030, GEO-E024) — it qualifies provenance-derived reasoning, not the direct microscopy and spectroscopy this record rests on.
Freestone, I. C. (2007)AI-verified citationGEO-C020