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Grandidierite
Grandidierite
☒

Sillimanite
Sillimanite
☒



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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
2.85-3.00
Uneven
Perfect
7.5
(Mg,Fe)Al 3(BO 4)(SiO 4)OUlrich Henn and Claudio C.
 
Tough
-
-
3.20-3.26
Splintery
{010} perfect
6-7.5
Al 2SiO 5Michael O’Donoghue , Gems, Sixth Edition (2006)

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Green Gemstones

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Hemimorphite
Sillimanite Vs Hemimorphite
Sillimanite
Hiddenite
Sillimanite Vs Hiddenite

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