Pezzottaite
From The Gemology Project
Revision as of 11:15, 15 October 2006 by Africanuck (talk | contribs)
Pezzotaite | |
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Chemical composition | Cesium Beryllium Lithium Aluminium Silicate Cs(Be2Li)Al2Si6O18 |
Crystal system | Trigonal |
Habit | subhedral-to-euhedral hexagonal tabular |
Cleavage | imperfect (basal) |
Fracture | conchoidal to irregular |
Hardness | 8 |
Optic nature | uniaxial - |
Refractive index | 1.601-1.620 |
Birefringence | 0.011 |
Dispersion | unknown |
Specific gravity | 3.04-3.14 |
Lustre | vitreous |
Pleochroism | moderate to strong |
A red to pink member of the beryl family named after Dr. Federico Pezzotta. Discovered in Madagascar,