Carnallite and Ettringite Physical Properties

Carnallite

Ettringite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Soluble

Partially soluble in water

1.3 Durability

Not Available

1.4 Specific Gravity

1.61.77

1 7.18

1.5 Fracture

Violet, Conchoidal, Brittle, Conchoidal, Brittle

Not Available

1.6 Cleavage

None

Perfect on {10 1 0}

1.7 Mohs Hardness

2.52-2.5

2 10

1.8 Chemical Composition

KMgCl3•6(H2O)

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

Carnallite and Ettringite Chemical Formula

While comparing Carnallite 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 Carnallite and Ettringite chemical formula.

Chemical formula of Carnallite- KMgCl3•6(H2O)
Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)

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Carnallite and Ettringite Specific Gravity

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