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Tanzanite Gemmology

Chemical Formula   CA2AI3[O| OH | SiO4 |Si2O7]
Classification   Silicate
Subclass   Sorosilicate
Group   Epidote
Subgroup   Zoisite
Crystal system   Orthorhombic
Classification Name   Dipyramidal
O.A.P. (Optical axial plane)   (010)
Space Group   Pnmc (standard orientation)
Cell Dimensions   a=16,21Å, b=5,561Å, c=10,039Å
Composition Unit   Z=4
Optic Sign   Biaxial (+)
Density   3,15 - 3,365 g/cm3
Hardness   6 - 7 Mohs Scale
Pleochroism   Strong: blue, violet-red and green-yellow
Dispersion   0,021
Cleavage   {100} perfect, {001} imperfect
Color   Blue
Streak   White
Normal Inclusions   Graphite Flakes
Original Color   Allochromatic
Refraktive Indizes  

α=1,696 - 1,700
β=1,696 - 1,702
γ=1,702 - 1,718

Ars Gemmeus - Diamond Arts • Q4, 18 Passage • 68161 Mannheim • Telephone: +49 (0)621.29996515 • info@arsgemmeus.com
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