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Chemical composition K-feldspar
Crystal system Monoclinic
Habit Prismatic
Cleavage Distinct to perfect
Fracture Conchoidal
Hardness 6
Optic nature Biaxial -
Refractive index ± 1.52
Specific gravity 2.56
Lustre Vitreous
Moonstone cabochon
Photo courtesy of Rick Martin
Art Cut Gems

Moonstone image gallery