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Demantoid Garnet
Chemical composition Ca3Fe2(SiO4)3

Calcium Iron Silicate

Crystal system Cubic
Habit dodecahedra
Cleavage none
Hardness 6.5
Optic nature isotrope
Refraction index 1.85-1.89
Birefringence none
Specific gravity 3.85
Lustre vitreous to adamantine