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OnyxBack to A - Z IndexChard 24 Carat Home Page
Bi-coloured Amethyst Citrine
Onyx is Related to Amethyst and Citrine
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Onyx
Onyx is a banded variety of chalcedony which is cryptocrystalline quartz. The colours of its bands are white and black. It is usually cut en 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.

Technical Details
Chemical Composition and NameSiO2 - Silicon Dioxide
Hardness7
Specific Gravity2.65 - 2.66
Refractive Index (R.I.)1.543 - 1.552 to 1.545 - 1.554
Bi-refringence0.009
Optic SignPositive
Optical CharacterUniaxial


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