Ettringite and Cinnabar Physical Properties

Ettringite

Cinnabar

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Physical Properties

Tenacity

Slightly sectile

Solubility

Partially soluble in water

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

Durability

Specific Gravity

1.772

1 7.18

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Fracture

Uneven

Cleavage

Perfect on {10 1 0}

Prismatic {10 1 0}, perfect

Mohs Hardness

2-2.52-2.5

2 10

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Chemical Composition

Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)

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

Ettringite and Cinnabar Chemical Formula

While comparing Ettringite 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 Ettringite and Cinnabar chemical formula.

Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Cinnabar- HgSMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Ettringite and Cinnabar Specific Gravity

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