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GEMMOLOGICAL PROPERTIES
Topaz
Family: |
Silicate Minerals |
Crystal System: |
Orthorhombic |
Specific Gravity: |
3.49–3.57 |
Hardness: |
8 |
Refrative Index: |
1.60 to 1.63 |
Chemical Composition: |
Al2SiO4(F,OH)2 |
Birefringence: |
0.010 |
Pleochroism: |
Weak |
Lustre: |
Vitreous |
Fracture: |
Conchoidal |
Cleavage: |
001 - Perfect |
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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