Polyhalite and Phenakite Physical Properties

Polyhalite

Phenakite

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Physical Properties

Tenacity

Brittle

Solubility

Soluble

Durability

Specific Gravity

2.782.90-2.98

1 7.18

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Fracture

Conchoidal

Conchoidal, ConchoidalWalter Schumann

Cleavage

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

Distinct on {11 2 0}, imperfect on {10 1 1}

Mohs Hardness

3.57.5-8

2 10

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Chemical Composition

K2Ca2Mg(SO4)4·2H2O

Be 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Polyhalite and Phenakite Chemical Formula

While comparing Polyhalite and Phenakite 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 Phenakite chemical formula.

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

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Polyhalite and Phenakite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Polyhalite and Phenakite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Polyhalite and Phenakite Optical Properties during the identification of gemstone. Specific gravity of Polyhalite is 2.90-2.98 whereas that of Phenakite is 2.90-2.98.