Gypsum and Sillimanite Physical Properties

Gypsum

Sillimanite

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1 Physical Properties

1.1 Tenacity

Flexible

Tough

1.2 Solubility

Soluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.20-2.403.20-3.26

1 7.18

1.5 Fracture

Conchoidal, Splintery, Fibrous, UnevenArthur Thomas, Gemstones (2009)

Splintery

1.6 Cleavage

Perfect on {010}, distinct on {100}

{010} perfect

1.7 Mohs Hardness

26-7.5

2 10

1.8 Chemical Composition

CaSO 4 -2(H 2O)Arthur Thomas , Gemstones (2009)

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

Gypsum and Sillimanite Chemical Formula

While comparing Gypsum 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 Gypsum and Sillimanite chemical formula.

Chemical formula of Gypsum- CaSO 4 -2(H 2O)Arthur Thomas , Gemstones (2009)
Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)

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Gypsum and Sillimanite Specific Gravity

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