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GEMMOLOGICAL PROPERTIES
Lapis Lazuli
Family: |
Lazurite(Crystalline) |
Crystal System: |
Dodecahedral |
Specific Gravity: |
2.7 - 2.9 |
Hardness: |
5.0 - 5.5 |
Refractive Index: |
1.5 |
Chemical Composition: |
(Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2 |
Birefringence: |
0.007 - 0.010 |
Lustre: |
Vitreous/Greasy |
Fracture: |
Choncoidal |
Cleavage: |
None |
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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