Gemstones Tools

Spinel

Fancy cut spinel
(spee-nell)

16th c.; lat. spina

Hard, variously colored mineral, having usually octahedral crystals and occurring in igneous and carbonate rocks. The red variety is valued as a gem and is sometimes confused with ruby
Color
Red, pink, orange, violet, blue, black
Family
Double oxide of magnesium and aluminum
Chemical composition
Mg (Al2O4)
Crystal system
Cubic
Hardness (Mohs scale)
8
Specific gravity
3,60 ±0,03
Refractive index
1,724 ±0,012
Birefringence
None
Optical character
Single refractive
Chanthaburi

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Jaipur

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