Dioptase

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Dioptase
Chemical composition	CuSiO₃H₂O
Crystal system	Trigonal
Habit	Prismatic
Cleavage	Perfect, rhombohedral
Fracture	Conchoidal to uneven
Hardness	5
Optic nature	Uniaxial +
Refractive index	1.644 - 1.709
Birefringence	0.053
Dispersion	Medium, 0.030
Specific gravity	3.28 - 3.35
Lustre	Vitreous
Pleochroism	Weak

Faceted Dioptase
Photo courtesty of The Gem Trader

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