Minerals and Metals in Ancient India v2.c43.s3.t7.18
Minerals and Metals in Ancient India v2.c43.s3.t7.18
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v2.c43.s3.t7.18
The above variety could have been manganese-containing quartz, usually known as amethyst. Agastimata described (AM, 323) different varieties of quartz: golden-hued, blue, resembling zircon, beryl or emerald etc. Blue-black quartz or nilagandhika was known to occur in the ruby mines of Sri Lanka: