Andalusite and Corundum Physical Properties

Andalusite

Corundum

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

insoluble

1.3 Durability

Not Available

1.4 Specific Gravity

3.05-3.213.90-4.05

1 7.18

1.5 Fracture

Uneven, Subconchoidal, Uneven, Subconchoidal, Splintery, UnevenArthur Thomas, Gemstones (2009)

Uneven, Uneven, Gems, Difficult, Fibrous

1.6 Cleavage

Good on {110}, poor on {100}

None – parting in 3 directions

1.7 Mohs Hardness

7.59

2 10

1.8 Chemical Composition

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

Al 2O 3Arthur Thomas , Gemstones (2009)

Andalusite and Corundum Chemical Formula

While comparing Andalusite and Corundum 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 Corundum chemical formula.

Chemical formula of Andalusite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Chemical formula of Corundum- Al 2O 3Arthur Thomas , Gemstones (2009)

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Andalusite and Corundum Specific Gravity

Another important criteria for qualitative analysis of gemstones is Andalusite and Corundum Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Andalusite and Corundum Optical Properties during the identification of gemstone. Specific gravity of Andalusite is 3.90-4.05 whereas that of Corundum is 3.90-4.05.