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Alunite
Alunite

Legrandite
Legrandite



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Alunite
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Legrandite

Alunite and Legrandite 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
-
-
3.98-4.04
Conchoidal
Imperfect, poor one {100}
4.5-5
Zn 2(AsO 4)(OH) · H 2OMichael O’Donoghue , Gems, Sixth Edition (2006) More from other references

Alunite and Legrandite Chemical Formula

While comparing Alunite and Legrandite 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 Legrandite chemical formula.

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Alunite and Legrandite Specific Gravity

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