Austinite and Petalite Physical Properties

Austinite

Petalite

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Physical Properties

Tenacity

Brittle

Solubility

Easily soluble in cold dilute HCl

insoluble

Durability

Specific Gravity

4.122.40

1 7.18

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Fracture

Uneven

Subconchoidal, ConchoidalWalter Schumann, Conchoidal

Cleavage

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

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

Mohs Hardness

4-4.56-6.5

2 10

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Chemical Composition

CaZn(AsO4)(OH)

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

Austinite and Petalite Chemical Formula

While comparing Austinite and Petalite 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 Petalite chemical formula.

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

Compare Green Gemstones

Austinite Vs Apophyllite KF

Austinite Vs Gaspeite

Austinite Vs Gyrolite

Austinite and Petalite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Austinite and Petalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Austinite and Petalite Optical Properties during the identification of gemstone. Specific gravity of Austinite is 2.40 whereas that of Petalite is 2.40.