Difference between revisions of "True Blue"
From The Gemology Project
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==External links== | ==External links== | ||
[http://www.truenorthgems.com/s/Photos_TrueBlue.asp True North Gems] | [http://www.truenorthgems.com/s/Photos_TrueBlue.asp True North Gems] | ||
+ | [http://www.geology.gov.yk.ca/publications/yeg/yeg04/21_turner.pdf#search=%22true%20blue%20aquamarine%5D%22 Mineralogical and geochemical study of True Blue Aquamarine Showing] |
Revision as of 07:49, 3 October 2006
True Blue beryl | |
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Chemical composition | Beryllium Aluminium Silicate Be3Al2(SiO3)6 |
Crystal system | Hexagonal |
Habit | edit me |
Cleavage | edit me |
Fracture | edit me |
Hardness | 7.5 |
Optic nature | edit me |
Refractive index | 1.57 - 1.58 |
Birefringence | edit me |
Dispersion | edit me |
Specific gravity | 2.69 |
Lustre | Vitreous |
Pleochroism | edit me |
External links
True North Gems Mineralogical and geochemical study of True Blue Aquamarine Showing