Andalusite and Variscite Physical Properties

Andalusite

Variscite

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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

3.05-3.212.42-2.58

1 7.18

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Fracture

Uneven, Subconchoidal, Splintery

Conchoidal, Splintery, ConchoidalWalter Schumann

Cleavage

Good on {110}, poor on {100}

[010] perfect

Mohs Hardness

7.54-5

2 10

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Chemical Composition

Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

AlPO₄ · 2(H₂O)

Andalusite and Variscite Chemical Formula

While comparing Andalusite and Variscite 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 Andalusite and Variscite chemical formula.

Chemical formula of Andalusite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Chemical formula of Variscite- AlPO₄ · 2(H₂O)

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Andalusite and Variscite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Andalusite and Variscite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Andalusite and Variscite Optical Properties during the identification of gemstone. Specific gravity of Andalusite is 2.42-2.58 whereas that of Variscite is 2.42-2.58.