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Cast, Not Carved · source record · paper

Compositional Categories of Ancient Glass

Sayre, E. V.; Smith, R. W. · 1961

AI-verified citationSRC-SAYRE-SMITH-1961
identifier / locator
Science 133(3467): 1824–1826. DOI: 10.1126/science.133.3467.1824
verification note
Accuracy correction recorded in the geo project: the plant-ash threshold is >2% for both MgO and K₂O, not the '>1% K' Fóti states.
reliability notes
  • Classic compositional typology; foundational and mainstream.

Evidence drawn from this source

Context· moderateGEO-E011

Compositional typology separating natron glass from plant-ash glass

what the source states
Ancient glasses divide into compositional categories; plant-ash glass is marked by both MgO and K₂O above roughly 2%, natron glass by low values of both.
what we infer
Provides the analytical tool behind natron-supply timelines. The geo project corrected Fóti's ">1% K" paraphrase to the paper's dual-oxide criterion.
Sayre, E. V. (1961)AI-verified citationGEO-C011