Ettringite and Halite Physical Properties

Ettringite

Halite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Partially soluble in water

Water-soluble

1.3 Durability

Not Available

1.4 Specific Gravity

1.772.17

1 7.18

1.5 Fracture

Not Available

Conchoidal, Brittle, Metallic

1.6 Cleavage

Perfect on {10 1 0}

Perfect {001}, three directions cubic

1.7 Mohs Hardness

2-2.52.0-2.5

2 10

1.8 Chemical Composition

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

NaCl

Ettringite and Halite Chemical Formula

While comparing Ettringite and Halite 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 Halite chemical formula.

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

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Ettringite and Halite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Ettringite and Halite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Ettringite and Halite Optical Properties during the identification of gemstone. Specific gravity of Ettringite is 2.17 whereas that of Halite is 2.17.