Cinnabar and Andradite Physical Properties

Cinnabar

Andradite

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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)

Durability

Specific Gravity

23.70-4.10

1 7.18

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Fracture

Uneven

Conchoidal, Uneven

Cleavage

Prismatic {10 1 0}, perfect

none

Mohs Hardness

2-2.56.5-7

2 10

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Chemical Composition

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

Ca 3Fe 2(SiO 4) 3Arthur Thomas , Gemstones (2009)

Cinnabar and Andradite Chemical Formula

While comparing Cinnabar and Andradite 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 Andradite chemical formula.

Chemical formula of Cinnabar- HgSMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Chemical formula of Andradite- Ca 3Fe 2(SiO 4) 3Arthur Thomas , Gemstones (2009)

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Cinnabar and Andradite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Cinnabar and Andradite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Cinnabar and Andradite Optical Properties during the identification of gemstone. Specific gravity of Cinnabar is 3.70-4.10 whereas that of Andradite is 3.70-4.10.