Sillimanite and Spinel Physical Properties

Sillimanite

Spinel

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1 Physical Properties

1.1 Tenacity

Tough

Not Available

1.2 Solubility

Not Available

none

1.3 Durability

Not Available

1.4 Specific Gravity

3.20-3.26

3.64-3.66

1.5 Fracture

Splintery

Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)

1.6 Cleavage

{010} perfect

None, but may exhibit slight parting

1.7 Mohs Hardness

6-7.5

1.8 Chemical Composition

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

MgAl₂O₄

Sillimanite and Spinel Chemical Formula

While comparing Sillimanite and Spinel 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 Sillimanite and Spinel chemical formula.

Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Spinel- MgAl₂O₄

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Sillimanite and Spinel Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sillimanite and Spinel Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Spinel Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 3.64-3.66 whereas that of Spinel is 3.64-3.66.