Minerals and Metals in Ancient India v2.c43.s1.t1.7
Minerals and Metals in Ancient India v2.c43.s1.t1.7
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v2.c43.s1.t1.7
industry. However this could be easily detected since the material glass has a low hardness of 5. On the other hand, distinguishing between zircon (7-1/2) and garnet (7-1/4) of similar colour and little difference in hardness required careful streak tests.