Petalite and Austinite Physical Properties

Petalite

Austinite

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Physical Properties

Tenacity

Brittle

Solubility

insoluble

Easily soluble in cold dilute HCl

Durability

Specific Gravity

2.404.12

1 7.18

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Fracture

Subconchoidal, ConchoidalWalter Schumann, Conchoidal

Uneven

Cleavage

Perfect on {001}, poor on {201} with 38.5° angle between the two

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

Mohs Hardness

6-6.54-4.5

2 10

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Chemical Composition

LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

CaZn(AsO4)(OH)

Petalite and Austinite Chemical Formula

While comparing Petalite 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 Petalite and Austinite chemical formula.

Chemical formula of Petalite- LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Chemical formula of Austinite- CaZn(AsO4)(OH)

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Petalite and Austinite Specific Gravity

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