A sample of Gypsum, a soft sulphate mineral composed of calcium sulphate dihydrate, with the chemical formula CaSO?·2H?O. Dated 20th Century

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Photo credit: © World History Archive / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: 20th, archival, archive, calcium, caso?·2h?, century, chemical, dihydrate, geology, gypsum, historical, history, mineral, sample, soft, sulphate