Difference between revisions of "Template:Diaspore"
From The Gemology Project
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|- | |- | ||
| Cleavage || Perfect to imperfect | | Cleavage || Perfect to imperfect | ||
+ | |- | ||
+ | | Fracture || Conchoidal | ||
+ | |- | ||
+ | | Luster || Bright vitreous to pearly (on cleavage surface). | ||
|- | |- | ||
| Hardness || 6.5 - 7 | | Hardness || 6.5 - 7 |
Latest revision as of 10:42, 30 August 2007
Diaspore | |
---|---|
Chemical composition | AlO(OH) |
Crystal system | Orthorhombic |
Habit | Tabular, sometimes fibrous |
Cleavage | Perfect to imperfect |
Fracture | Conchoidal |
Luster | Bright vitreous to pearly (on cleavage surface). |
Hardness | 6.5 - 7 |
Optic nature | Biaxial + |
Refractive index | 1.682 - 1.752 |
Birefringence | 0.040 - 0.048 |
Specific gravity | 3.2 - 3.5 |
Lustre | Vitreous |
Pleochroism | Moderate |