Gemstones Tools

Turquoise

Turquoise oval cabochon
(tû'r-koiz')

16th c.; fre. turquoyse; geo. Turkestan

Blue to blue-green mineral made of aluminum and copper, considered as a gemstone and used in jewelry in its polished blue form
Color
Light to dark blue to blue green
Family
Hydrous copper-aluminum phosphate
Chemical composition
CuAl6(PO4)4(OH)8 4H2O
Crystal system
Triclinic - Cryptocristalline
Hardness (Mohs scale)
5 - 6
Specific gravity
2,72 ±0,12
Refractive index
1,61 ±0,01
Birefringence
Optical character
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Chanthaburi

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