Andalusite and Aragonite Physical Properties

Andalusite

Aragonite

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Physical Properties

Tenacity

Brittle

Solubility

Dilute acid

Durability

Specific Gravity

3.05-3.212.93-2.96

1 7.18

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Fracture

Uneven, Subconchoidal, Splintery

Subconchoidal, Conchoidal

Cleavage

Good on {110}, poor on {100}

Distinct on {010}, imperfect {110} and {011}

Mohs Hardness

7.53.5-4

2 10

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Chemical Composition

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

CaCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Andalusite and Aragonite Chemical Formula

While comparing Andalusite and Aragonite 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 Aragonite chemical formula.

Chemical formula of Andalusite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Chemical formula of Aragonite- CaCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Compare Brown Gemstones

Andalusite Vs Apatite

Andalusite Vs Apophyllite

Andalusite Vs Aragonite

Andalusite and Aragonite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Andalusite and Aragonite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Andalusite and Aragonite Optical Properties during the identification of gemstone. Specific gravity of Andalusite is 2.93-2.96 whereas that of Aragonite is 2.93-2.96.