Template:Tourmaline
From The Gemology Project
Revision as of 09:40, 2 October 2006 by Africanuck (talk | contribs)
Tourmaline | |
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Chemical composition | Complex Borosilicate |
Crystal system | Trigonal |
Habit | edit me |
Cleavage | edit me |
Fracture | edit me |
Hardness | 7.5 |
Optic nature | edit me |
Refraction index | 1.62 - 1.64 |
Birefringence | edit me |
Dispersion | edit me |
Specific gravity | 3.06 |
Lustre | Vitreous |
Pleochroism | edit me |