Assertion: pyramid's stone | /r/MadeOf | 85-90% calcite
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Source sentences:
text: Research of J. Davidovits into ancient geopolymers has demonstrated through chemical X-ray analysis that the casing stones of the Giza pyramids are synthetic, being of lower density than any quarried stone due to trapped air bubbles and consisting of 85-90% calcite with other exotic mineral constituents like opal CT, hydroxy-apatite and silico-aluminates.