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Sillimanite
Sillimanite
☒

Verdite
Verdite
☒



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Sillimanite
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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
Tough
-
-
3.20-3.26
Splintery
{010} perfect
6-7.5
Al 2SiO 5Michael O’Donoghue , Gems, Sixth Edition (2006)
 
-
-
-
2.80-3.0
-
{110} Good
3
NaFeS2•2(H2O)

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