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Uvarovite Garnet
Chemical composition Ca3Cr2(SiO4)3

Calcium chromium silicate

Crystal system Cubic
Habit Dodecahedra
Cleavage None
Hardness 7.5
Optic nature Isotropic
Refractive index 1.86-1.87
Birefringence None
Specific gravity 3.77
Lustre Vitreous
Photo courtesy of Rick Martin

Uvarovite is hardly ever found in crystals large enough to be cut into gemstones.