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Moonstone

Moonstone cabochon
(moon--ston')

11th c; ind-eur root moo; Ger. stein , Slav. stena, Sansk. styayate

A gemstone variety of the mineral potassium feldspar. It has a pale opalescent lustre because of its fine-scale oriented microstructure, showing an effect called adularescence
Color
Transparent to translucent colorless to white
Family
Feldspar
Chemical composition
KAlSi3O8
Crystal system
Monoclinic
Hardness (Mohs scale)
6 - 6,5
Specific gravity
2,56 ±0,01
Refractive index
1,518 - 1,526
Birefringence
0,008
Optical character
Biaxial -
Chanthaburi

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Jaipur

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