Andalusite and Caledonite Physical Properties

Andalusite

Caledonite

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Physical Properties

Tenacity

Brittle

Solubility

Durability

Specific Gravity

3.05-3.215.6-5.76

1 7.18

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Fracture

Uneven, Subconchoidal, Splintery

Uneven

Cleavage

Good on {110}, poor on {100}

[001] perfect; [100] distinct

Mohs Hardness

7.52.5-3

2 10

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Chemical Composition

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

Pb 5Cu 2(SO 4) 3(CO 3)(OH) 6Anthony et al , Handbook of mineralogy (2001)

Andalusite and Caledonite Chemical Formula

While comparing Andalusite and Caledonite 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 Caledonite chemical formula.

Chemical formula of Andalusite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Chemical formula of Caledonite- Pb 5Cu 2(SO 4) 3(CO 3)(OH) 6Anthony et al , Handbook of mineralogy (2001)

Compare Brown Gemstones

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Andalusite Vs Apophyllite

Andalusite Vs Aragonite

Andalusite and Caledonite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Andalusite and Caledonite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Andalusite and Caledonite Optical Properties during the identification of gemstone. Specific gravity of Andalusite is 5.6-5.76 whereas that of Caledonite is 5.6-5.76.