Cinnabar and Austinite Physical Properties

Cinnabar

Austinite

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Physical Properties

Tenacity

Slightly sectile

Brittle

Solubility

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

Easily soluble in cold dilute HCl

Durability

Specific Gravity

24.12

1 7.18

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Fracture

Uneven

Cleavage

Prismatic {10 1 0}, perfect

Good in two directions parallel to the prism faces {110}

Mohs Hardness

2-2.54-4.5

2 10

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Chemical Composition

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

CaZn(AsO4)(OH)

Cinnabar and Austinite Chemical Formula

While comparing Cinnabar and Austinite 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 Cinnabar and Austinite chemical formula.

Chemical formula of Cinnabar- HgSMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Chemical formula of Austinite- CaZn(AsO4)(OH)

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Cinnabar and Austinite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Cinnabar and Austinite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Cinnabar and Austinite Optical Properties during the identification of gemstone. Specific gravity of Cinnabar is 4.12 whereas that of Austinite is 4.12.