Biotite and Chrysoprase Physical Properties
Tenacity
Brittle
  
Not Available
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2.7-3.3
  
2.58-2.64
  
Fracture
Uneven, Even, Yellow, White
  
Gems, Sixth Edition (2006)
  
Cleavage
Perfect on the {001}
  
None
  
Mohs Hardness
2.5-3.0
  
6.5-7
  
Chemical Composition
K(Mg,Fe++)3[AlSi3O10(OH,F)2
  
SiO2 (with a high level of nickel impurities )
  
Biotite and Chrysoprase Chemical Formula
While comparing Biotite and Chrysoprase 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 Chrysoprase chemical formula.
- Chemical formula of Biotite- K(Mg,Fe++)3[AlSi3O10(OH,F)2
- Chemical formula of Chrysoprase- SiO2 (with a high level of nickel impurities )
Biotite and Chrysoprase Specific Gravity
Another important criteria for qualitative analysis of gemstones is Biotite and Chrysoprase Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Biotite and Chrysoprase Optical Properties during the identification of gemstone. Specific gravity of Biotite is 2.58-2.64 whereas that of Chrysoprase is 2.58-2.64.