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Forsterite
Forsterite

Sillimanite
Sillimanite



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Forsterite
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Sillimanite

Forsterite and Sillimanite Physical Properties

1 Physical Properties
1.1 Tenacity
Not Available
Tough
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
3.23-3.263.20-3.26
Amber
1 7.18
1.5 Fracture
Conchoidal, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle
Splintery
1.6 Cleavage
Perfect on {010} imperfect on {100}
{010} perfect
1.7 Mohs Hardness
6.5-76-7.5
Amber
2 10
1.8 Chemical Composition
Mg 2SiO 4Michael O’Donoghue , Gems, Sixth Edition (2006)
Al 2SiO 5Michael O’Donoghue , Gems, Sixth Edition (2006)

Forsterite and Sillimanite Chemical Formula

While comparing Forsterite 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 Forsterite and Sillimanite chemical formula.

  • Chemical formula of Forsterite- Mg 2SiO 4Michael O’Donoghue , Gems, Sixth Edition (2006)
  • Chemical formula of Sillimanite- Al 2SiO 5Michael O’Donoghue , Gems, Sixth Edition (2006)

Forsterite and Sillimanite Specific Gravity

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