Template:Bixbite
From The Gemology Project
Revision as of 11:35, 1 November 2006 by Africanuck (talk | contribs)
Bixbite | |
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Chemical composition | Beryllium Aluminium Silicate Be3Al2(SiO3)6 |
Crystal system | Hexagonal |
Habit | prismatic |
Cleavage | basal, poor |
Fracture | conchoidal to uneven |
Hardness | 7.5 - 8 |
Optic nature | uniaxial - |
Refractive index | 1.561 - 1.577 |
Birefringence | 0.004 - 0.009 |
Dispersion | low, 0.014 |
Specific gravity | 2.63 - 2.72 |
Lustre | Vitreous |
Pleochroism | weak |