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Sillimanite
Sillimanite

Thulite
Thulite



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Sillimanite
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Thulite

Sillimanite and Thulite Physical Properties

1 Physical Properties
1.1 Tenacity
Tough
Not Available
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
3.20-3.263.1
Amber
1 7.18
1.5 Fracture
Splintery
Uneven, Conchoidal, ConchoidalArthur Thomas, Gemstones (2009)
1.6 Cleavage
{010} perfect
Perfect {010} imperfect {100}
1.7 Mohs Hardness
6-7.56-7
Amber
2 10
1.8 Chemical Composition
Al 2SiO 5Michael O’Donoghue , Gems, Sixth Edition (2006)
Ca2Al3(SiO4)3(OH)

Sillimanite and Thulite Chemical Formula

While comparing Sillimanite and Thulite 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 Thulite chemical formula.

  • Chemical formula of Sillimanite- Al 2SiO 5Michael O’Donoghue , Gems, Sixth Edition (2006)
  • Chemical formula of Thulite- Ca2Al3(SiO4)3(OH)

Sillimanite and Thulite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sillimanite and Thulite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Thulite Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 3.1 whereas that of Thulite is 3.1.