Hematite and Sillimanite Physical Properties

Hematite

Sillimanite

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1 Physical Properties

1.1 Tenacity

Brittle

Tough

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

5.00-5.303.20-3.26

1 7.18

1.5 Fracture

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

Splintery

1.6 Cleavage

None, may show partings on {0001} and {10 1 1}

{010} perfect

1.7 Mohs Hardness

66-7.5

2 10

1.8 Chemical Composition

Fe 2O 3Arthur Thomas , Gemstones (2009)

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

Hematite and Sillimanite Chemical Formula

While comparing Hematite 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 Hematite and Sillimanite chemical formula.

Chemical formula of Hematite- Fe 2O 3Arthur Thomas , Gemstones (2009)
Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)

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Hematite and Sillimanite Specific Gravity

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