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Alunite
Alunite

Epidote
Epidote



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Alunite
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Epidote

Alunite and Epidote 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
 
-
-
-
3.25-3.50
Conchoidal, Fibrous
{001} perfect and {100} imperfect
6-7
CaAl 2(Fe3+ ,Al)Si 3O 12(OH)Michael O’Donoghue , Gems, Sixth Edition (2006) More from other references

Alunite and Epidote Chemical Formula

While comparing Alunite and Epidote 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 Epidote chemical formula.

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Alunite and Epidote Specific Gravity

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