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Alunite
Alunite
☒

Sillimanite
Sillimanite
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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
Brittle
Soluble
-
2.6-2.9
Conchoidal, Uneven
On {0001}, perfect
3.5-4
KAl3(SO4)2(OH)6
 
Tough
-
-
3.20-3.26
Splintery
{010} perfect
6-7.5
Al 2SiO 5Michael O’Donoghue , Gems, Sixth Edition (2006)

Compare Red Gemstones

Red Gemstones

Polyhalite
Polyhalite
Vanadinite
Vanadinite
Jacinth
Jacinth
Sillimanite
Bornite
Sillimanite Vs Bornite
Sillimanite
Carnallite
Sillimanite Vs Carnallite
Sillimanite
Piemontite
Sillimanite Vs Piemontite

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