Difference between revisions of "Aquamarine"
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Revision as of 23:49, 13 September 2006
Aquamarine | |
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Chemical composition | Be3Al2(SiO3)6 Beryllium aluminum silicate |
Crystal system | Hexagonal |
Habit | Prismatic |
Cleavage | Imperfect, basal, almost never seen |
Hardness | 7.5 to 8 |
Optic nature | Uniaxial - |
Refractive index | 1.577-1.583 (+0.017, - 0.017) |
Birefringence | 0.005-0.009 |
Dispersion | Low, 0.014 |
Specific gravity | 2.72 (+0.18,-0.5) |
Lustre | Vitreous |
Pleochroism | Weak to moderate |