Difference between revisions of "Template:Bixbite"
From The Gemology Project
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| Optic nature || uniaxial - | | Optic nature || uniaxial - | ||
|- | |- | ||
− | | | + | | Refractive index || 1.561 - 1.577 |
|- | |- | ||
| Birefringence || 0.004 - 0.009 | | Birefringence || 0.004 - 0.009 |
Revision as of 11:35, 1 November 2006
Bixbite | |
---|---|
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 |