Calcite

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