Andalusite and Apatite Physical Properties

Andalusite

Apatite

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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

3.05-3.213.16-3.23

1 7.18

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Fracture

Uneven, Subconchoidal, Splintery

Conchoidal, Uneven, Conchoidal to uneven

Cleavage

Good on {110}, poor on {100}

[0001] indistinct, [1010] indistinct

Mohs Hardness

7.55

2 10

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Chemical Composition

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

Ca 5(PO 4) 3(F,OH,Cl)Walter Schumann , Gemstones of the world (2001) More from other references

Andalusite and Apatite Chemical Formula

While comparing Andalusite and Apatite 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 Apatite chemical formula.

Chemical formula of Andalusite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Chemical formula of Apatite- Ca 5(PO 4) 3(F,OH,Cl)Walter Schumann , Gemstones of the world (2001) More from other references

Compare Brown Gemstones

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Andalusite and Apatite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Andalusite and Apatite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Andalusite and Apatite Optical Properties during the identification of gemstone. Specific gravity of Andalusite is 3.16-3.23 whereas that of Apatite is 3.16-3.23.