Template:Coral
From The Gemology Project
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 |