Sphene

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Sphene
Chemical composition	CaTiOSiO₄
Crystal system	Monoclinic
Habit	Wedge shaped, massive
Cleavage	Distinct, prismatic
Fracture	Conchoidal
Hardness	5.0-5.5
Optic nature	Biaxial +
Refractive index	1.880-2.099
Birefringence	0.100-0.135
Dispersion	High, 0.051
Specific gravity	3.45-3.55
Lustre	Resinous to sub-adamantine
Pleochroism	Distinct to strong

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