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Austinite
Austinite

Andradite
Andradite



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Austinite
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Andradite

Austinite and Andradite Physical Properties

Physical Properties

Tenacity

Brittle
Brittle

Solubility

Easily soluble in cold dilute HCl
-

Durability

-
-

Specific Gravity

4.123.70-4.10
1 7.18
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Fracture

Uneven
Conchoidal, Uneven

Cleavage

Good in two directions parallel to the prism faces {110}
none

Mohs Hardness

4-4.56.5-7
2 10
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Chemical Composition

CaZn(AsO4)(OH)
Ca 3Fe 2(SiO 4) 3Arthur Thomas , Gemstones (2009)

Austinite and Andradite Chemical Formula

While comparing Austinite and Andradite 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 Andradite chemical formula.

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

Austinite and Andradite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Austinite and Andradite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Austinite and Andradite Optical Properties during the identification of gemstone. Specific gravity of Austinite is 3.70-4.10 whereas that of Andradite is 3.70-4.10.