The amethyst is a variety of quartz. Very estimate being a part of the family of silicates. His tint coloring is due to transfers of load between O2-towards Fe4.
Colour : purple, purple purple
Luster : glassy
Origin : the main deposits are Brazil, Uruguay, Bolivia, Argentina, the United States, east Africa, Zambia, Namibia, Madagascar, India, Sri Lanka, Russia, Australia.
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