Polyhalite and Nephrite Physical Properties

Polyhalite

Nephrite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Soluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.782.90-3.10

1 7.18

1.5 Fracture

Conchoidal, Brittle

Splintery, Granular, Splintery, Granular, Gemstones (2009)

1.6 Cleavage

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

Not Available

1.7 Mohs Hardness

3.56-6.5

2 10

1.8 Chemical Composition

Not Available

Ca 2(Mg,Fe) 5(OH) 2Walter Schumann , Gemstones of the world (2001) More from other references

Polyhalite and Nephrite Chemical Formula

While comparing Polyhalite and Nephrite 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 Polyhalite and Nephrite chemical formula.

Chemical formula of Nephrite- Ca 2(Mg,Fe) 5(OH) 2Walter Schumann , Gemstones of the world (2001) More from other references

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Polyhalite and Nephrite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Polyhalite and Nephrite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Polyhalite and Nephrite Optical Properties during the identification of gemstone. Specific gravity of Polyhalite is 2.90-3.10 whereas that of Nephrite is 2.90-3.10.