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Polyhalite
Polyhalite

Fayalite
Fayalite



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Polyhalite
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Fayalite

Polyhalite and Fayalite Physical Properties

Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
Brittle
Soluble
-
2.78
Conchoidal
Perfect on {10 1 }; parting on {010}
3.5
K2Ca2Mg(SO4)4·2H2O
 
-
-
-
4.392
Conchoidal
{010} moderate, {100} imperfect
6.5-7
Fe 2SiO 4Michael O’Donoghue , Gems, Sixth Edition (2006)

Polyhalite and Fayalite Chemical Formula

While comparing Polyhalite and Fayalite 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 Polyhalite and Fayalite chemical formula.

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Polyhalite and Fayalite Specific Gravity

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