Andalusite and Pyrite Physical Properties

Andalusite

Pyrite

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Physical Properties

Tenacity

Brittle

Solubility

insoluble in water

Durability

Specific Gravity

3.05-3.215.00-5.20

1 7.18

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Fracture

Uneven, Subconchoidal, Splintery

Uneven, Conchoidal, ConchoidalWalter Schumann

Cleavage

Good on {110}, poor on {100}

Indistinct on {001}; partings on {011} and {111}

Mohs Hardness

7.56-6.5

2 10

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Chemical Composition

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

FeS 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Andalusite and Pyrite Chemical Formula

While comparing Andalusite and Pyrite 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 Pyrite chemical formula.

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

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Andalusite and Pyrite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Andalusite and Pyrite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Andalusite and Pyrite Optical Properties during the identification of gemstone. Specific gravity of Andalusite is 5.00-5.20 whereas that of Pyrite is 5.00-5.20.