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Bi-coloured Amethyst Citrine
Chrysoprase is Related to Amethyst and Citrine
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Chrysoprase is a green variety of chalcedony which is cryptocrystalline quartz. Its green colour is due to the presence of nickel impurities in the form of oxides or silicates of nickel. It can vary from a greenish yellow to a clear apple green. It is usually cut en cabochon, or into beads, and is also used for intaglios and cameos. Imitations of chrysoprase are made by the staining of agate.

Chrysoprase was known from ancient Greek and Roman times, although its ancient source is not known. It has been found at Zabkowice in Silesia, the Urals, California, and other parts of the USA.

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

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