Ettringite and Vlasovite Physical Properties

Ettringite

Vlasovite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Partially soluble in water

Nearly insoluble in HCl and HNO₃

1.3 Durability

Not Available

1.4 Specific Gravity

1.772.97

1 7.18

1.5 Fracture

Not Available

Conchoidal, Brittle

1.6 Cleavage

Perfect on {10 1 0}

Distinct on {010}

1.7 Mohs Hardness

2-2.56

2 10

1.8 Chemical Composition

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

Not Available

Ettringite and Vlasovite Chemical Formula

While comparing Ettringite and Vlasovite 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 Vlasovite chemical formula.

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

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Ettringite and Vlasovite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Ettringite and Vlasovite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Ettringite and Vlasovite Optical Properties during the identification of gemstone. Specific gravity of Ettringite is 2.97 whereas that of Vlasovite is 2.97.