History of Chemistry in Ancient and Medieval India, Incorporating the History of Hindu Chemistry by Acharya Prafulla Chandra Ray c27.s1.1
History of Chemistry in Ancient and Medieval India, Incorporating the History of Hindu Chemistry by Acharya Prafulla Chandra Ray c27.s1.1
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c27.s1.1
There are three varieties of mica, namely, *pinakam*, *nagamandukam* and *vajram*, and each of these again are of four different colours—white, red, yellow and black.