Difference between revisions of "Bi-color"
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{{Bi-color}} | {{Bi-color}} | ||
+ | '''Properties in table to be verified please!''' | ||
+ | [[Image:Bi_Color2.jpg|left|thumb|300px|Bi-color tourmaline<br />Photo courtesy of Lembeck Gems]]<br clear="left" /> |
Latest revision as of 01:44, 10 January 2007
Bi-color Tourmaline | |
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Chemical composition | Complex borosilicate |
Crystal system | Trigonal |
Habit | Prismatic |
Cleavage | None |
Fracture | Conchoidal |
Hardness | 7- 7.5 |
Optic nature | Uniaxial - |
Refractive index | 1.62 - 1.64 |
Birefringence | 0.014 - 0.040 |
Dispersion | Low, 0.017 |
Specific gravity | 3.01 - 3.11 |
Lustre | Vitreous |
Pleochroism | Strong |
Properties in table to be verified please!