Tanzanite

Tanzanite

Hardness ( Moh )

" 6.5 - 7

Crystal System

Orthorhombic

Specific Gravity

3.28 - 3.35

Refractive Index

1.692 - 1.705

Birefringence

Family

Zoisite

Colour(s)

Royal Blue, Indigo, Violet/Purple

Cleavage

Francture Type

Uneven to conchoidal

Luster

Streak

White

Transparency

Transparent to subtranslucent

Formula

(Ca2Al3(SiO4)(Si2O7)O(OH)) + (Cr,Sr)

Country

Found In Tanzania