Gemstones Tools

Tourmaline

Green tourmaline oval cut
(toor'-ma-lin')

18th c.; sinha. touramalli

Complex crystalline silicate containing aluminum, boron, and other elements, used in electronic instrumentation and, especially in its red, green, and blue varieties, mounted in jewelry
Color
All colors
Family
Complex silicate of aluminum and boron
Chemical composition
(Na,Ca)(li,Mg,Al)3Al6B3Si6O27(OH,F)4 + others metals
Crystal system
Hexagonal
Hardness (Mohs scale)
7 - 7,5
Specific gravity
3,10 ±0,10
Refractive index
1,624 - 1,644 ±0,006
Birefringence
0,020
Optical character
Uniaxial -
Chanthaburi

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Jaipur

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