Sillimanite and Labradorite Physical Properties
Tenacity
Tough
  
Not Available
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.20-3.26
  
2.69-2.72
  
Fracture
Splintery
  
Uneven, Conchoidal, Gems, Sixth Edition (2006)
  
Cleavage
{010} perfect
  
Perfect on {001}, less perfect on {010}, intersecting at near 90°; distinct on {110}
  
Mohs Hardness
6-7.5
  
6-6.5
  
Chemical Composition
Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
  
(Na,Ca)1-2Si3-2O8
  
Sillimanite and Labradorite Chemical Formula
While comparing Sillimanite and Labradorite 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 Labradorite chemical formula.
- Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
- Chemical formula of Labradorite- (Na,Ca)1-2Si3-2O8
Sillimanite and Labradorite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Sillimanite and Labradorite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Labradorite Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 2.69-2.72 whereas that of Labradorite is 2.69-2.72.