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GEMMOLOGICAL PROPERTIES
Andalusite
Family: |
Nesosilicate Mineral |
Crystal System: |
Orthorhombic |
Specific Gravity: |
3.2 |
Hardness: |
7.5 |
Refractive Index: |
1.62 - 1.65 |
Chemical Composition: |
Al2SiO5 |
Birefringence: |
0.007 - 0.013 |
Pleochroism: |
Strong: Yellow - Green to Red - Brown |
Lustre: |
Vitreous |
Fracture: |
Uneven, Chonchoidal |
Cleavage: |
Distinct in one direction |
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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