Augite and Polyhalite Physical Properties

Augite

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

3.19-3.562.78

1 7.18

1.5 Fracture

Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle, Conchoidal

Conchoidal, Brittle

1.6 Cleavage

{110} Perfect, {010} Indistinct

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

1.7 Mohs Hardness

5.5-63.5

2 10

1.8 Chemical Composition

(Ca,Na)(Mg,Fe,Al,Ti)(Si,Al) 2O 6Anthony et al , Handbook of mineralogy (2001)

Not Available

Augite and Polyhalite Chemical Formula

While comparing Augite 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 Augite and Polyhalite chemical formula.

Chemical formula of Augite- (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al) 2O 6Anthony et al , Handbook of mineralogy (2001)

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Augite and Polyhalite Specific Gravity

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