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Musgravite
Musgravite
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Sillimanite
Sillimanite
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Musgravite
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Sillimanite
Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
3.62-3.68
Conchoidal
Distinct
8-8.5
(Mg,Fe,Zn)Al 6BeO 12Ulrich Henn and Claudio C.
 
Tough
-
-
3.20-3.26
Splintery
{010} perfect
6-7.5
Al 2SiO 5Michael O’Donoghue , Gems, Sixth Edition (2006)