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Onyx

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Occurring naturally in a variety of colors, black onyx is polished to enhance appearance, a member of the quartz family.

Originally, almost all colors of chalcedony from white to dark brown and black were called onyx (SiO2 with impurities).

Physical Properties of Onyx

Onyx is a form of chalcedony, part of the quartz group. Like the other stones in the chalcedony family, onyx has a smooth, waxy luster. Onyx can be found in a wide range of colors, often layered.


Specific Gravity: 2.58 - 2.64
Refractive Index: 1.55 - 1.54
Hardness: 6.5 - 7.0 on Moh's sc

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