Coral

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Coral
Chemical composition Aragonite (CaCO3)or conchioline
Crystal system Amorphous
Habit Branching, tree-like
Hardness 2.5 - 3.5
Refractive index 1.48 - 1.56
Specific gravity 1.37 - 2.60
Lustre Waxy


Sources

  • Gemmology 3rd edition (2005) - Peter G. Read