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Crystal Tanzanite

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Chemical Formula

Ca2Al3(SiO4)3(OH)

Color

Blue, Purple

Hardness

6 - 6.5

Crystal System

Orthorhombic

Refractive Index

1.69 - 1.70

SG

3.2 - 3.4

Transparency

Transparent to translucent

Double Refraction

.009

Luster

Vitreous

Cleavage

1,1

Mineral Class

Zoisite

 

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