Polyhalite and Cinnabar Physical Properties

Polyhalite

Cinnabar

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Physical Properties

Tenacity

Brittle

Slightly sectile

Solubility

Soluble

1.04 x 10⁻²⁵ g per 100 ml water (Ksp at 25°C = 2 x 10⁻³²)

Durability

Specific Gravity

2.782

1 7.18

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Fracture

Conchoidal

Uneven

Cleavage

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

Prismatic {10 1 0}, perfect

Mohs Hardness

3.52-2.5

2 10

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Chemical Composition

K2Ca2Mg(SO4)4·2H2O

HgSMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Polyhalite and Cinnabar Chemical Formula

While comparing Polyhalite and Cinnabar 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 Cinnabar chemical formula.

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

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Polyhalite and Cinnabar Specific Gravity

Another important criteria for qualitative analysis of gemstones is Polyhalite and Cinnabar Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Polyhalite and Cinnabar Optical Properties during the identification of gemstone. Specific gravity of Polyhalite is 2 whereas that of Cinnabar is 2.