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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