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Home » Onyx Stone

Onyx Stone

Quick Facts on Onyx Stone

Chemical Formula :SiO2
Mineral :Chalcedony
Color :White to grey, light blue, orange to red, black
Hardness : 6.5 - 7.0
Specific Gravity :2.58-2.64
Onyx Stone Onyx ia a chalcedony that occurs in bands of different colors. It is composed of relatively straight, parallel layers of different colors. When the dark layers are brown or brownish red, it is often called Sardonyx. Onyx is a form of agate with parallel banding. This structure lends itself to cameo making.

It is usually cut into cabochon, or into beads, and is also used for intaglios and cameos. Some onyx is natural but much is produced by the staining of agate. It is available in the regions of USA, Germany, Brazil, Mexico, India, and Africa.




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