Pyrite and Sillimanite Physical Properties

Pyrite

Sillimanite

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1 Physical Properties

1.1 Tenacity

Brittle

Tough

1.2 Solubility

insoluble in water

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

5.00-5.203.20-3.26

1 7.18

1.5 Fracture

Uneven, Conchoidal, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references, Brittle

Splintery

1.6 Cleavage

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

{010} perfect

1.7 Mohs Hardness

6-6.56-7.5

2 10

1.8 Chemical Composition

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

Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)

Pyrite and Sillimanite Chemical Formula

While comparing Pyrite and Sillimanite 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 Pyrite and Sillimanite chemical formula.

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

Compare Yellow Gemstones

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Pyrite and Sillimanite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Pyrite and Sillimanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Pyrite and Sillimanite Optical Properties during the identification of gemstone. Specific gravity of Pyrite is 3.20-3.26 whereas that of Sillimanite is 3.20-3.26.