Polyhalite and Hemimorphite Physical Properties

Polyhalite

Hemimorphite

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1 Physical Properties

1.1 Tenacity

Brittle

1.2 Solubility

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

2.783.30-3.50

1 7.18

1.5 Fracture

Conchoidal, Brittle

Uneven, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references, Conchoidal, Brittle

1.6 Cleavage

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

Perfect on {110}, poor on {101}, {001} rare

1.7 Mohs Hardness

3.55

2 10

1.8 Chemical Composition

Not Available

Zn 4Si 2O 7(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Polyhalite and Hemimorphite Chemical Formula

While comparing Polyhalite and Hemimorphite 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 Hemimorphite chemical formula.

Chemical formula of Hemimorphite- Zn 4Si 2O 7(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Polyhalite Vs Heliotrope

Polyhalite and Hemimorphite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Polyhalite and Hemimorphite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Polyhalite and Hemimorphite Optical Properties during the identification of gemstone. Specific gravity of Polyhalite is 3.30-3.50 whereas that of Hemimorphite is 3.30-3.50.