Polyhalite and Fluorite Physical Properties

Polyhalite

Fluorite

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1 Physical Properties

1.1 Tenacity

Brittle

1.2 Solubility

Soluble

slightly water soluble and in hot hydrochloric acid

1.3 Durability

Not Available

1.4 Specific Gravity

2.783.00-3.25

1 7.18

1.5 Fracture

Conchoidal, Brittle

Subconchoidal, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references

1.6 Cleavage

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

Octahedral, perfect on {111}, parting on {011}

1.7 Mohs Hardness

3.54

2 10

1.8 Chemical Composition

Not Available

CaF₂

Polyhalite and Fluorite Chemical Formula

While comparing Polyhalite and Fluorite 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 Fluorite chemical formula.

Chemical formula of Fluorite- CaF₂

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Polyhalite and Fluorite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Polyhalite and Fluorite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Polyhalite and Fluorite Optical Properties during the identification of gemstone. Specific gravity of Polyhalite is 3.00-3.25 whereas that of Fluorite is 3.00-3.25.