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Gypsum
Gypsum

Sillimanite
Sillimanite



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Gypsum
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Sillimanite

Gypsum and Sillimanite Physical Properties

Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
Flexible
Soluble
-
2.20-2.40
Conchoidal, Splintery, Fibrous
Perfect on {010}, distinct on {100}
2
CaSO 4 -2(H 2O)Arthur Thomas , Gemstones (2009)
 
Tough
-
-
3.20-3.26
Splintery
{010} perfect
6-7.5
Al 2SiO 5Michael O’Donoghue , 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.

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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 Vs Sillimanite during the identification of gemstone. Specific gravity of Gypsum is whereas that of Sillimanite is .