Polyhalite and Cassiterite Physical Properties

Polyhalite

Cassiterite

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Physical Properties

Tenacity

Brittle

Solubility

Soluble

insoluble

Durability

Specific Gravity

2.786.86-7.03

1 7.18

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Fracture

Conchoidal

Subconchoidal, Uneven, Conchoidal, Irregular

Cleavage

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

{100} imperfect, {110} indistinct; partings on {111} or {011}

Mohs Hardness

3.56-7

2 10

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Chemical Composition

K2Ca2Mg(SO4)4·2H2O

SnO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Polyhalite and Cassiterite Chemical Formula

While comparing Polyhalite and Cassiterite 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 Cassiterite chemical formula.

Chemical formula of Polyhalite- K2Ca2Mg(SO4)4·2H2O
Chemical formula of Cassiterite- SnO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Polyhalite and Cassiterite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Polyhalite and Cassiterite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Polyhalite and Cassiterite Optical Properties during the identification of gemstone. Specific gravity of Polyhalite is 6.86-7.03 whereas that of Cassiterite is 6.86-7.03.