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Alunite
Alunite

Staurolite
Staurolite



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Alunite
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Staurolite

Alunite and Staurolite Physical Properties

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
 
Brittle
-
-
3.7-3.8
Subconchoidal, Conchoidal
Distinct on {010}
7-7.5
(Fe,Mg,Zn) 2Al 9(Si,Al) 4O 22(OH) 2Ulrich Henn and Claudio C.

Alunite and Staurolite Chemical Formula

While comparing Alunite and Staurolite physical properties, the important data you should know is its chemical composition. Since chemical formula defines the molecular structure of the crystal, most of the physical properties like color, tenacity, solubility are governed by Alunite and Staurolite chemical formula.

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Alunite and Staurolite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alunite and Staurolite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alunite Vs Staurolite during the identification of gemstone. Specific gravity of Alunite is whereas that of Staurolite is .