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Alunite
Alunite

Rhodolite
Rhodolite



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Alunite
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Rhodolite
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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
 
-
-
-
3.84
Conchoidal
none, may show indistinct parting
7-7.5
(Mg,Fe)3Al2Si3O12