Sylvite and Ettringite Physical Properties

Sylvite

Ettringite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Soluble

Partially soluble in water

1.3 Durability

Not Available

1.4 Specific Gravity

1.9931.77

1 7.18

1.5 Fracture

Uneven, Brittle

Not Available

1.6 Cleavage

Perfect on [100], [010], [001]

Perfect on {10 1 0}

1.7 Mohs Hardness

2.52-2.5

2 10

1.8 Chemical Composition

Not Available

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

Sylvite and Ettringite Chemical Formula

While comparing Sylvite 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 Sylvite and Ettringite 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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Sylvite and Ettringite Specific Gravity

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