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Tanzanite and Indicolite Blue Tourmaline Physical Properties


Physical Properties

Tenacity
Not Available   
Not Available   

Solubility
Not Available   
Not Available   

Durability
Not Available   
Hard   

Specific Gravity
3.05-3.11   
3.35   

Fracture
Not Available   
Uneven, Conchoidal, UnevenWalter Schumann, Gemstones of the world (2001)   

Cleavage
Not Available   
Perfect {010}, imperfect {100}   

Mohs Hardness
7-7.5   
6.5-7   

Chemical Composition
Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) Formula given for elbaite.   
Ca2Al3(SiO4)3(OH)   

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