Cinnabar and Goethite Physical Properties

Cinnabar

Goethite

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Physical Properties

Tenacity

Slightly sectile

Solubility

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

HCl soluble

Durability

Specific Gravity

24.27-4.29

1 7.18

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Fracture

Uneven

Cleavage

Prismatic {10 1 0}, perfect

Perfect {010}

Mohs Hardness

2-2.55-5.5

2 10

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Chemical Composition

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

FeO(OH)Arthur Thomas , Gemstones (2009)

Cinnabar and Goethite Chemical Formula

While comparing Cinnabar and Goethite 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 Goethite chemical formula.

Chemical formula of Cinnabar- HgSMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Chemical formula of Goethite- FeO(OH)Arthur Thomas , Gemstones (2009)

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Cinnabar and Goethite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Cinnabar and Goethite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Cinnabar and Goethite Optical Properties during the identification of gemstone. Specific gravity of Cinnabar is 4.27-4.29 whereas that of Goethite is 4.27-4.29.