Sillimanite and Sunstone Physical Properties
Tenacity
Tough
  
Not Available
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.20-3.26
  
2.62-2.65
  
Fracture
Splintery
  
Gemstones of the world (2001)
  
Cleavage
{010} perfect
  
001
  
Mohs Hardness
6-7.5
  
6
  
Chemical Composition
Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
  
Microcline: KAlSi3O8 Oligoclase: (Na,Ca)Al1-2Si3-2O8
  
Sillimanite and Sunstone Chemical Formula
While comparing Sillimanite and Sunstone 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 Sunstone chemical formula.
- Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
- Chemical formula of Sunstone- Microcline: KAlSi3O8 Oligoclase: (Na,Ca)Al1-2Si3-2O8
Sillimanite and Sunstone Specific Gravity
Another important criteria for qualitative analysis of gemstones is Sillimanite and Sunstone Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Sunstone Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 2.62-2.65 whereas that of Sunstone is 2.62-2.65.