Minerals and Metals in Ancient India v2.c43.s3.t11.1
Minerals and Metals in Ancient India v2.c43.s3.t11.1
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v2.c43.s3.t11.1
Turquoise (hardness 6) and Lapis Lazuli (5-1/2) are famous as two relatively soft blue gems. These were widely used in the ancient world, which had not yet invented the techniques to cut and process the harder gems such as blue sapphire (9).