Austinite and Ettringite Physical Properties

Austinite

Ettringite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Easily soluble in cold dilute HCl

Partially soluble in water

1.3 Durability

Not Available

1.4 Specific Gravity

4.121.77

1 7.18

1.5 Fracture

Brittle, Uneven, Brittle, Uneven

Not Available

1.6 Cleavage

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

Perfect on {10 1 0}

1.7 Mohs Hardness

4-4.52-2.5

2 10

1.8 Chemical Composition

CaZn(AsO4)(OH)

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

Austinite and Ettringite Chemical Formula

While comparing Austinite 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 Austinite and Ettringite chemical formula.

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

Compare Green Gemstones

Austinite Vs Clintonite

Austinite Vs Apophyllite KF

Austinite Vs Cordierite

Austinite and Ettringite Specific Gravity

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