Chrysoprase

Chrysoprase is one chalcedony natural uniformly green, colored by the nickel.

Color: green
Hardness: 6,5 / 7
Refractive index: 1,530 - 1,545
Density: 2,56 - 2,66
Chemical composition: SiO2 (dioxide of sillicium)
Crystalline structure: Trigonal / Microcrystalline
Luster: glassy, fat, resinous
Origin: Poland, Russia, the United States, Australia, Africa (Tanzania), etc.

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