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Selenite
Selenite

Sillimanite
Sillimanite



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Selenite
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Sillimanite

Selenite and Sillimanite Physical Properties

1 Physical Properties
1.1 Tenacity
Not Available
Tough
1.2 Solubility
Not Available
Not Available
1.2 Durability
Not Available
Not Available
1.4 Specific Gravity
Not Available3.20-3.26
Amber
1 7.18
1.7 Fracture
Not Available
Splintery
1.9 Cleavage
Not Available
{010} perfect
1.11 Mohs Hardness
26-7.5
Amber
2 10
1.13 Chemical Composition
Not Available
Al 2SiO 5Michael O’Donoghue , Gems, Sixth Edition (2006)

Selenite and Sillimanite Chemical Formula

While comparing Selenite 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 Selenite and Sillimanite chemical formula.

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  • Chemical formula of Sillimanite- Al 2SiO 5Michael O’Donoghue , Gems, Sixth Edition (2006)

Selenite and Sillimanite Specific Gravity

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