Pargasite and Polyhalite Physical Properties

Pargasite

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

3.04-3.262.78

1 7.18

1.5 Fracture

Splintery, Brittle, Uneven

Conchoidal, Brittle

1.6 Cleavage

{110} perfect

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

1.7 Mohs Hardness

5-63.5

2 10

1.8 Chemical Composition

NaCa 2(Mg 4Al)Si 6Al 2O 22(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)

Not Available

Pargasite and Polyhalite Chemical Formula

While comparing Pargasite 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 Pargasite and Polyhalite chemical formula.

Chemical formula of Pargasite- NaCa 2(Mg 4Al)Si 6Al 2O 22(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)

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Pargasite and Polyhalite Specific Gravity

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