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Sillimanite
Sillimanite

Peridot
Peridot



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Sillimanite
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Peridot

Sillimanite and Peridot 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
3.20-3.261.54-1.55
Amber
1 7.18
1.5 Fracture
Splintery
Conchoidal
1.6 Cleavage
{010} perfect
Poor
1.7 Mohs Hardness
6-7.56.5-7
Amber
2 10
1.8 Chemical Composition
Al 2SiO 5Michael O’Donoghue , Gems, Sixth Edition (2006)
(Mg,Fe)2SiO4

Sillimanite and Peridot Chemical Formula

While comparing Sillimanite and Peridot 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 Peridot chemical formula.

  • Chemical formula of Sillimanite- Al 2SiO 5Michael O’Donoghue , Gems, Sixth Edition (2006)
  • Chemical formula of Peridot- (Mg,Fe)2SiO4

Sillimanite and Peridot Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sillimanite and Peridot Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Peridot Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 1.54-1.55 whereas that of Peridot is 1.54-1.55.