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TANZANITE

           
 
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TANZANITE
Gemstone:
Shape:
Weight (ct):
 to
 
 
Tanzanite Facts
Category Mineral Variety
Chemical formula (Ca2Al3(SiO4)(Si2O7)O(OH))
Identification
Color Purple to Blue
Crystal habit Crystals flattened in an acicular manner, may be fibrously curved
Crystal system Orthorhombic
Cleavage Perfect {010} imperfect {100}
Fracture Uneven to conchoidal
Mohs Scale hardness 6.5
Luster Vitreous, pearly on cleavage surfaces
Refractive index 1.69-1.70
Optical Properties biaxial positive
Birefringence 0.006-0.018
Pleochroism Present, dichroism or trichroism depending on color.
Streak White or colorless
Specific gravity 3.10-3.38