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Alunite
Alunite

Witherite
Witherite



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Alunite
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Witherite

Alunite and Witherite 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
 
-
-
-
4.27-4.35
Conchoidal
{010} Distinct
3-3.5
BaCO 3Michael O’Donoghue , Gems, Sixth Edition (2006) More from other references

Alunite and Witherite Chemical Formula

While comparing Alunite and Witherite 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 Witherite chemical formula.

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Alunite and Witherite Specific Gravity

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