Brucite and Sillimanite Physical Properties
Tenacity
Sectile
  
Tough
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2.39
  
3.20-3.26
  
Fracture
Irregular
  
Splintery
  
Cleavage
Perfect on {0001}
  
{010} perfect
  
Mohs Hardness
2.5
  
6-7.5
  
Chemical Composition
Mg(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)
  
Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
  
Brucite and Sillimanite Chemical Formula
While comparing Brucite 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 Brucite and Sillimanite chemical formula.
- Chemical formula of Brucite- Mg(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)
- Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Brucite and Sillimanite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Brucite and Sillimanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Brucite and Sillimanite Optical Properties during the identification of gemstone. Specific gravity of Brucite is 3.20-3.26 whereas that of Sillimanite is 3.20-3.26.