Bytownite and Polyhalite Physical Properties

Bytownite

Polyhalite

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1 Physical Properties

1.1 Tenacity

Brittle

1.2 Solubility

Not Available

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

2.72-2.752.78

1 7.18

1.5 Fracture

Uneven, Uneven, Gems, Sixth Edition (2006)

Conchoidal, Brittle

1.6 Cleavage

Perfect on [001], good on [010], imperfect on [110]

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

1.7 Mohs Hardness

6-6.53.5

2 10

1.8 Chemical Composition

Ca(70-90%)Na(30-10%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)

Not Available

Bytownite and Polyhalite Chemical Formula

While comparing Bytownite 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 Bytownite and Polyhalite chemical formula.

Chemical formula of Bytownite- Ca(70-90%)Na(30-10%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)

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Bytownite and Polyhalite Specific Gravity

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