Topaz and Polyhalite Physical Properties

Topaz

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

3.49-3.572.78

1 7.18

1.5 Fracture

Subconchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle

Conchoidal, Brittle

1.6 Cleavage

[001] Perfect

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

1.7 Mohs Hardness

83.5

2 10

1.8 Chemical Composition

Al₂SiO₄(F,OH)₂

Not Available

Topaz and Polyhalite Chemical Formula

While comparing Topaz 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 Topaz and Polyhalite chemical formula.

Chemical formula of Topaz- Al₂SiO₄(F,OH)₂

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Topaz and Polyhalite Specific Gravity

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