Anhydrite and Ettringite Physical Properties

Anhydrite

Ettringite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Not Available

Partially soluble in water

1.3 Durability

Not Available

1.4 Specific Gravity

2.90-2.981.77

1 7.18

1.5 Fracture

Conchoidal, Brittle, Conchoidal, UnevenArthur Thomas, Gemstones (2009), Brittle, Conchoidal

Not Available

1.6 Cleavage

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

Perfect on {10 1 0}

1.7 Mohs Hardness

3.52-2.5

2 10

1.8 Chemical Composition

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

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

Anhydrite and Ettringite Chemical Formula

While comparing Anhydrite and Ettringite 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 Anhydrite and Ettringite chemical formula.

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

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Anhydrite and Ettringite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Anhydrite and Ettringite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Anhydrite and Ettringite Optical Properties during the identification of gemstone. Specific gravity of Anhydrite is 1.77 whereas that of Ettringite is 1.77.