Difference between revisions of "Template:Andalusite"
From The Gemology Project
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| Chemical composition || Al<sub>2</sub>SiO<sub>5</sub> | | Chemical composition || Al<sub>2</sub>SiO<sub>5</sub> | ||
|- | |- | ||
− | | Crystal system || | + | | Crystal system || Orthorhombic |
|- | |- | ||
− | | Habit || | + | | Habit || Prismatic |
|- | |- | ||
− | | Cleavage || | + | | Cleavage || Distinct |
|- | |- | ||
− | | Fracture || | + | | Fracture || Sub-conchoidal |
|- | |- | ||
| Hardness || 7.5 | | Hardness || 7.5 | ||
|- | |- | ||
− | | Optic nature || | + | | Optic nature || Biaxial - |
|- | |- | ||
− | | | + | | Refractive index || 1.63-1.64 |
|- | |- | ||
| Birefringence || 0.010 | | Birefringence || 0.010 | ||
|- | |- | ||
− | | Dispersion || | + | | Dispersion || Low, 0.016 |
|- | |- | ||
| Specific gravity || 3.18 | | Specific gravity || 3.18 | ||
|- | |- | ||
− | | Lustre || | + | | Lustre || Vitreous |
|- | |- | ||
− | | Pleochroism || | + | | Pleochroism || Very strong |
|} | |} |
Latest revision as of 19:49, 20 December 2006
Andalusite | |
---|---|
Chemical composition | Al2SiO5 |
Crystal system | Orthorhombic |
Habit | Prismatic |
Cleavage | Distinct |
Fracture | Sub-conchoidal |
Hardness | 7.5 |
Optic nature | Biaxial - |
Refractive index | 1.63-1.64 |
Birefringence | 0.010 |
Dispersion | Low, 0.016 |
Specific gravity | 3.18 |
Lustre | Vitreous |
Pleochroism | Very strong |