Almandine and Austinite Physical Properties

Almandine

Austinite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

Easily soluble in cold dilute HCl

1.3 Durability

Not Available

1.4 Specific Gravity

3.95-4.30

4.12

1.5 Fracture

Conchoidal, Brittle, Conchoidal, Brittle, Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal

Brittle, Uneven, Brittle, Uneven

1.6 Cleavage

none

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

1.7 Mohs Hardness

7-7.5

4-4.5

1.8 Chemical Composition

Fe 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)

CaZn(AsO4)(OH)

Almandine and Austinite Chemical Formula

While comparing Almandine 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 Almandine and Austinite chemical formula.

Chemical formula of Almandine- Fe 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
Chemical formula of Austinite- CaZn(AsO4)(OH)

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Almandine and Austinite Specific Gravity

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