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Rock crystal

Ritual dorji in rock crystal
(rok-kris'-tal)

17th c.; lat. crystallum, gr. krystallos

Colorless transparent quartz, used in optical instruments and as a semiprecious gemstone
Color
Colorless
Family
Quartz
Chemical composition
SiO2
Crystal system
Hexagonal
Hardness (Mohs scale)
7
Specific gravity
2,66 ±0,01
Refractive index
1,544 - 1,553
Birefringence
0,009
Optical character
Uniaxial +
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