Feldspar and Polyhalite Physical Properties

Feldspar

Polyhalite

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2 Physical Properties

2.2 Tenacity

Not Available

Brittle

2.3 Solubility

Not Available

Soluble

2.4 Durability

Not Available

2.5 Specific Gravity

2.56-2.752.78

1 7.18

2.9 Fracture

Uneven, Conchoidal, Uneven, Conchoidal, Gemstones of the world (2001)

Conchoidal, Brittle

2.10 Cleavage

two or three

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

2.11 Mohs Hardness

6-6.53.5

2 10

2.12 Chemical Composition

Not Available

Feldspar and Polyhalite Chemical Formula

While comparing Feldspar 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 Feldspar and Polyhalite chemical formula.

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Feldspar and Polyhalite Specific Gravity

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