Sard and Polyhalite Physical Properties

Sard

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

2.58-2.632.78

1 7.18

1.5 Fracture

ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)

Conchoidal, Brittle

1.6 Cleavage

Not Available

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

1.7 Mohs Hardness

6.5-73.5

2 10

1.8 Chemical Composition

SiO 2Ulrich Henn and Claudio C.

Not Available

Sard and Polyhalite Chemical Formula

While comparing Sard 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 Sard and Polyhalite chemical formula.

Chemical formula of Sard- SiO 2Ulrich Henn and Claudio C.

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Sard and Polyhalite Specific Gravity

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