History of Chemistry in Ancient and Medieval India, Incorporating the History of Hindu Chemistry by Acharya Prafulla Chandra Ray c39.s6.5
History of Chemistry in Ancient and Medieval India, Incorporating the History of Hindu Chemistry by Acharya Prafulla Chandra Ray c39.s6.5
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c39.s6.5
According to some, precious stones are rocks (or earths) metamorphosed by natural process in the course of ages.