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Alunite
Alunite
☒

Dumortierite
Dumortierite
☒



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Alunite
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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
 
-
-
-
3.26-3.41
Fibrous, ConchoidalWalter Schumann
Distinct on {100}, poor on {110}; parting on {001}
7-8.5
AlAl6O3BSi3O18

Compare Red Gemstones

Red Gemstones

Polyhalite
Polyhalite
Vanadinite
Vanadinite
Jacinth
Jacinth
Dumortierite
Bornite
Dumortierite Vs Bornite
Dumortierite
Carnallite
Dumortierite Vs Carnallite
Dumortierite
Piemontite
Dumortierite Vs Piemontite

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