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Forsterite
Forsterite

Alunite
Alunite



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Forsterite
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Alunite

Forsterite and Alunite Physical Properties

Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
3.23-3.26
Conchoidal
Perfect on {010} imperfect on {100}
6.5-7
Mg 2SiO 4Michael 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

Forsterite and Alunite Chemical Formula

While comparing Forsterite 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 Forsterite and Alunite chemical formula.

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Forsterite and Alunite Specific Gravity

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