Labradorite and Polyhalite Physical Properties

Labradorite

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

2.69-2.722.78

1 7.18

1.5 Fracture

Uneven, Conchoidal, Gems, Sixth Edition (2006)

Conchoidal, Brittle

1.6 Cleavage

Perfect on {001}, less perfect on {010}, intersecting at near 90°; distinct on {110}

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

1.7 Mohs Hardness

6-6.53.5

2 10

1.8 Chemical Composition

(Na,Ca)_1-2Si_3-2O₈

Not Available

Labradorite and Polyhalite Chemical Formula

While comparing Labradorite 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 Labradorite and Polyhalite chemical formula.

Chemical formula of Labradorite- (Na,Ca)_1-2Si_3-2O₈

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Labradorite and Polyhalite Specific Gravity

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