Afghanite and Polyhalite Physical Properties

Afghanite

Polyhalite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

2.55-2.65

2.78

1.5 Fracture

Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle, Conchoidal, Brittle

Conchoidal, Brittle

1.6 Cleavage

Perfect {10 1 0}

Perfect on {10 1 }; parting on {010}

1.7 Mohs Hardness

5.5-6

3.5

1.8 Chemical Composition

(Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)

Not Available

Afghanite and Polyhalite Chemical Formula

While comparing Afghanite and Polyhalite 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 Afghanite and Polyhalite chemical formula.

Chemical formula of Afghanite- (Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)

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Afghanite and Polyhalite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Afghanite and Polyhalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Afghanite and Polyhalite Optical Properties during the identification of gemstone. Specific gravity of Afghanite is 2.78 whereas that of Polyhalite is 2.78.