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Onyx-Gemstones

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Group: Quartz
Hardness: 7
Specific Gravity: 2,58-2,64
Crystal System: trigonal
Index of Refraction: 1,530-1,539
Transparency: translucent


It is a variety of Chalcedony and, chemically made up of silicon dioxide/silicate. It occurs in solid black and also in black and white streaks.Mining for Onyx is very common worldwide, particularly in Brazil, India, Madagascar, Namibia, and Uruguay.

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