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Smoky quartz

Oval cut smoky quartz
(smo-kee'-kwôrtz)

17th c.; ger. med. quarz; slav. quarc; ind-eur smeug(h)

Transparent or semitransparent light brown to nearly black variety of quartz, used as a gemstone, also called cairngorm
Color
Smoky yellow to smoky brown
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 +
Chanthaburi

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Jaipur

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