Minerals and Metals in Ancient India v2.c43.s3.t11.7
Minerals and Metals in Ancient India v2.c43.s3.t11.7
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v2.c43.s3.t11.7
It is surprising that in Rayaṇaparikkhā, Ṭhakkura Pherū mentioned turquoise but not the other famous blue gem, lapis lazuli which used to be imported to India over centuries since the Harappan era. Lapis lazuli (hardness 5-1/2), the richly coloured blue material is a heterogeneous mixture of several minerals: