Difference between revisions of "Template:Sapphire"
From The Gemology Project
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| Crystal system || [[Crystals_&_Their_Structure#Trigonal_Crystal_System | Trigonal]] | | Crystal system || [[Crystals_&_Their_Structure#Trigonal_Crystal_System | Trigonal]] | ||
|- | |- | ||
− | | Habit || | + | | Habit || Prismatic, tabular |
|- | |- | ||
− | | Cleavage || | + | | Cleavage || Poor |
|- | |- | ||
− | | Fracture || | + | | Fracture || Conchoidal |
|- | |- | ||
| Hardness || 9 | | Hardness || 9 | ||
|- | |- | ||
− | | Optic nature || | + | | Optic nature || Uniaxial - |
|- | |- | ||
| Refractive index || 1.76-1.78 | | Refractive index || 1.76-1.78 | ||
Line 21: | Line 21: | ||
| Birefringence || 0.008-0.009 | | Birefringence || 0.008-0.009 | ||
|- | |- | ||
− | | Dispersion || | + | | Dispersion || Low, 0.018 |
|- | |- | ||
| Specific gravity || 4 | | Specific gravity || 4 | ||
|- | |- | ||
− | | Lustre || | + | | Lustre || Bright vitreous |
|- | |- | ||
− | | Pleochroism || | + | | Pleochroism || Weak to moderate |
|} | |} |
Revision as of 20:05, 23 December 2006
Sapphire | |
---|---|
Chemical composition | Al2O3 |
Crystal system | Trigonal |
Habit | Prismatic, tabular |
Cleavage | Poor |
Fracture | Conchoidal |
Hardness | 9 |
Optic nature | Uniaxial - |
Refractive index | 1.76-1.78 |
Birefringence | 0.008-0.009 |
Dispersion | Low, 0.018 |
Specific gravity | 4 |
Lustre | Bright vitreous |
Pleochroism | Weak to moderate |