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Brucite
Brucite

Alunite
Alunite



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Brucite
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Alunite

Brucite and Alunite Physical Properties

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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
Sectile
-
-
2.39
Irregular
Perfect on {0001}
2.5
Mg(OH) 2Michael O’Donoghue , Gems, Sixth Edition (2006)
 
Brittle
Soluble
-
2.6-2.9
Conchoidal, Uneven
On {0001}, perfect
3.5-4
KAl3(SO4)2(OH)6

Brucite and Alunite Chemical Formula

While comparing Brucite and Alunite 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 Brucite and Alunite chemical formula.

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Brucite and Alunite Specific Gravity

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