Biotite and Prase Physical Properties
Tenacity
Brittle
  
Not Available
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2.7-3.3
  
2.64-2.69
  
Fracture
Uneven, Even, Yellow, White
  
Gems, Sixth Edition (2006), Gems, Sixth Edition (2006)
  
Cleavage
Perfect on the {001}
  
Not Available
  
Mohs Hardness
2.5-3.0
  
7
  
Chemical Composition
K(Mg,Fe++)3[AlSi3O10(OH,F)2
  
SiO 2Michael OâDonoghue , Gems, Sixth Edition (2006)
  
Biotite and Prase Chemical Formula
While comparing Biotite and Prase 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 Biotite and Prase chemical formula.
- Chemical formula of Biotite- K(Mg,Fe++)3[AlSi3O10(OH,F)2
- Chemical formula of Prase- SiO 2Michael OâDonoghue , Gems, Sixth Edition (2006)
Biotite and Prase Specific Gravity
Another important criteria for qualitative analysis of gemstones is Biotite and Prase Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Biotite and Prase Optical Properties during the identification of gemstone. Specific gravity of Biotite is 2.64-2.69 whereas that of Prase is 2.64-2.69.