Minerals and Metals in Ancient India v2.c43.s3.t1.6
Minerals and Metals in Ancient India v2.c43.s3.t1.6
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v2.c43.s3.t1.6
Another mehtod of categorisation was in terms of the crystalline properties. Pure diamond crystal was known to be octahedral, with eight symmetric facets (*samaphalaka*), twelve sharp edges (*dhārā*), six prominent solid angles (*koṇa*):