Ettringite and Anhydrite Physical Properties

Ettringite

Anhydrite

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Physical Properties

Tenacity

Brittle

Solubility

Partially soluble in water

Durability

Specific Gravity

1.772.90-2.98

1 7.18

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Fracture

Conchoidal

Cleavage

Perfect on {10 1 0}

Rare tabular and prismatic crystals. Usually occurs as fibrous, parallel veins that break off into cleavage fragments.

Mohs Hardness

2-2.53.5

2 10

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Chemical Composition

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

CaSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

Ettringite and Anhydrite Chemical Formula

While comparing Ettringite and Anhydrite 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 Anhydrite chemical formula.

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

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Ettringite and Anhydrite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Ettringite and Anhydrite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Ettringite and Anhydrite Optical Properties during the identification of gemstone. Specific gravity of Ettringite is 2.90-2.98 whereas that of Anhydrite is 2.90-2.98.