Ettringite and Sodalite Physical Properties

Ettringite

Sodalite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Partially soluble in water

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

1.772.15-2.40

1 7.18

1.5 Fracture

Not Available

Conchoidal, Uneven, UnevenArthur Thomas, Brittle

1.6 Cleavage

Perfect on {10 1 0}

Poor on {110}

1.7 Mohs Hardness

2-2.55-6

2 10

1.8 Chemical Composition

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

Na₈Al₆Si₆O₂₄Cl₂

Ettringite and Sodalite Chemical Formula

While comparing Ettringite and Sodalite 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 Sodalite chemical formula.

Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Sodalite- Na₈Al₆Si₆O₂₄Cl₂

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Ettringite and Sodalite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Ettringite and Sodalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Ettringite and Sodalite Optical Properties during the identification of gemstone. Specific gravity of Ettringite is 2.15-2.40 whereas that of Sodalite is 2.15-2.40.