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GEMMOLOGICAL PROPERTIES
Iolite
Family: |
Cordierite |
Crystal System: |
Orthorhombic |
Specific Gravity: |
2.57 - 2.66 |
Hardness: |
7 - 7.5 |
Refractive Index: |
1.52 - 1.57 |
Chemical Composition: |
(Mg,Fe)2Al4Si5O18 |
Birefringence: |
0.008 - 0.012 |
Pleochroism: |
Strong, Dichroic. |
Lustre: |
Vitreous |
Fracture: |
Chonchoidal |
Cleavage: |
Poor (010) |
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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