Template:Goshenite
From The Gemology Project
Revision as of 11:42, 1 November 2006 by Africanuck (talk | contribs)
Goshenite | |
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Chemical composition | Beryllium Aluminium Silicate Be3Al2(SiO3)6 |
Crystal system | Hexagonal |
Habit | prismatice |
Cleavage | poor, basal |
Fracture | conchoidal to uneven |
Hardness | 7.5 |
Optic nature | uniaxial - |
Refractive index | 1.57 - 1.59 |
Birefringence | 0.004 - 0.009 |
Dispersion | low, 0.014 |
Specific gravity | 2.7 - 2.9 |
Lustre | Vitreous |
Pleochroism | none |