Ettringite and Austinite Physical Properties

Ettringite

Austinite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Partially soluble in water

Easily soluble in cold dilute HCl

1.3 Durability

Not Available

1.4 Specific Gravity

1.774.12

1 7.18

1.5 Fracture

Not Available

Brittle, Uneven, Brittle, Uneven

1.6 Cleavage

Perfect on {10 1 0}

Good in two directions parallel to the prism faces {110}

1.7 Mohs Hardness

2-2.54-4.5

2 10

1.8 Chemical Composition

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

CaZn(AsO4)(OH)

Ettringite and Austinite Chemical Formula

While comparing Ettringite and Austinite 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 Austinite chemical formula.

Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Austinite- CaZn(AsO4)(OH)

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Ettringite and Austinite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Ettringite and Austinite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Ettringite and Austinite Optical Properties during the identification of gemstone. Specific gravity of Ettringite is 4.12 whereas that of Austinite is 4.12.