Template:Calcite

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Calcite
Chemical composition	CaCO₃
Crystal system	Hexagonal(Trigonal)
Habit	Massive
Hardness	3
Specific gravity	2.69 - 2.71
Refractive Index	1.486 - 1.658
Birefringence	0.172 - 0.19 Uniaxial negative
Lustre	Vitreous

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