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16.25: Calcite

Last updated

May 6, 2022
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- 16.24: Bowenite
- 16.26: Charoite

gemology
Gemology Project

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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

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