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chalcedony blue cab gem thb - Newest pictures

☹Gemstone Chalcedony☹

Chalcedony is the form of Quartzthat is compact and microcrystalline. It occurs in many different forms, colors, and patterns, and many varieties have been used as gemstones since antiquity. In the gemstone trade, the term Chalcedony is often used specifically to describe the white, gray, or blue translucenttype of Chalcedony, but its technical term includes all additional varieties.
Chemical FormulaSio2
ColorWhite, Blue, Red, Green, Yellow, Orange, Brown, Pink, Purple, Gray, Black, Banded, Multicolored
Hardness6.5 - 7
Crystal System Hexagonal
Refractive Index1.54 - 1.55
SG2.63 - 2.65
Transparency Translucentto opaque
Double Refraction.009
Luster Vitreousto waxy
Mineral Class Quartz( Chalcedony)

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