Blue Chalcedony

Chalcedony is a part of the family of the quartz.

Color: blue-bluish, light blue, white to White - clear-green Milky, grey-green, blue Grey clearly, Sometimes Opalescent, green, brown, yellow, orange, pink, red, purple, black.
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: Germany, Austria, Italy, Brazil, Uruguay, the United States, etc.

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