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GEMMOLOGICAL PROPERTIES
Sapphire
Family: |
Corundum |
Crystal System: |
Trigonal |
Specific Gravity: |
3.95 to 4.10 |
Hardness: |
9 |
Refractive Index: |
1.76- 1.77 |
Chemical Composition: |
Al2O3 |
Birefringence: |
0.008 |
Pleochroism: |
Strong |
Lustre: |
Admantine-Vitreous |
Cleavage: |
None |
Fracture: |
Uneven, Chonchoidal |
This gemmological data has been provided by an external consultant. If you notice any errors or omissions - or if you would like to offer a suggestion to improve this service - please contact: webmaster@ajtd.com.au |
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