Goethite and Cinnabar Physical Properties

Goethite

Cinnabar

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Physical Properties

Tenacity

Slightly sectile

Solubility

HCl soluble

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

Durability

Specific Gravity

4.27-4.292

1 7.18

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Fracture

Uneven

Cleavage

Perfect {010}

Prismatic {10 1 0}, perfect

Mohs Hardness

5-5.52-2.5

2 10

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Chemical Composition

FeO(OH)Arthur Thomas , Gemstones (2009)

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

Goethite and Cinnabar Chemical Formula

While comparing Goethite 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 Goethite and Cinnabar chemical formula.

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

Compare Brown Gemstones

Goethite Vs Manganaxinite

Goethite Vs Mellite

Goethite Vs Povondraite

Goethite and Cinnabar Specific Gravity

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