Liddicoatite
From The Gemology Project
Rubellite Tourmaline | |
---|---|
Chemical composition | Complex Borosilicate |
Crystal system | Trigonal |
Habit | prismatic |
Cleavage | none |
Fracture | conchoidal |
Hardness | 7.5 |
Optic nature | uniaxial - |
Refractive index | 1.62 - 1.64 |
Birefringence | 0.014 - 0.022 |
Dispersion | low, 0.018 |
Specific gravity | 3.06 |
Lustre | Vitreous |
Pleochroism | weak to strong |
A German Film on Crystal Structure of Madagascar Liddicoatite
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