History of Technology in India, Vol. I: From Antiquity to c. 1200 A.D. v1.c18.s4.t4.32

v1.c18.s4.t4.32

In minerals Mica is Ferromagnesium aluminium silicate compound which when treated with māraṇa treatment may convert into an Iron and Aluminium oxide. Chalcopyrite may convert into Copper and Iron Sulphide, Zincite into Zinc oxide, Copper Sulphate into Copper Sulphide, Ferrous Sulphate into Ferric oxide and Calcium Carbonate into Calcium oxide etc. compounds. Many minerals are used only after their purification treatments which means these are used in their original form and compounds. As in their case probably no change in their compound is considered necessary to achieve their therapeutic effectiveness.