Andalusite and Zoisite Physical Properties

Andalusite

Zoisite

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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

3.05-3.213.20-3.50

1 7.18

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Fracture

Uneven, Subconchoidal, Splintery

Uneven, Conchoidal, Even

Cleavage

Good on {110}, poor on {100}

Perfect {010} imperfect {100}

Mohs Hardness

7.56-7

2 10

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Chemical Composition

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

Ca₂Al₃(SiO₄)₃(OH)

Andalusite and Zoisite Chemical Formula

While comparing Andalusite and Zoisite 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 Zoisite chemical formula.

Chemical formula of Andalusite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Chemical formula of Zoisite- Ca₂Al₃(SiO₄)₃(OH)

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Andalusite and Zoisite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Andalusite and Zoisite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Andalusite and Zoisite Optical Properties during the identification of gemstone. Specific gravity of Andalusite is 3.20-3.50 whereas that of Zoisite is 3.20-3.50.