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Alunite
Alunite

Anhydrite
Anhydrite



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Alunite
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Anhydrite

Alunite and Anhydrite Physical Properties

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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
 
Brittle
-
-
2.90-2.98
Conchoidal
Rare tabular and prismatic crystals. Usually occurs as fibrous, parallel veins that break off into cleavage fragments.
3.5
CaSO 4Michael O’Donoghue , Gems, Sixth edition (2006) More from other references

Alunite and Anhydrite Chemical Formula

While comparing Alunite and Anhydrite 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 Anhydrite chemical formula.

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Alunite and Anhydrite Specific Gravity

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