Biotite and Emerald Physical Properties
Tenacity
Brittle
  
Not Available
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Hard
  
Specific Gravity
2.7-3.3
  
2.67-2.78
  
Fracture
Uneven, Even, Yellow, White
  
Uneven, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001)
  
Cleavage
Perfect on the {001}
  
Imperfect on the [0001]
  
Mohs Hardness
2.5-3.0
  
7.5-8
  
Chemical Composition
K(Mg,Fe++)3[AlSi3O10(OH,F)2
  
Be3Al2SiO6
  
Biotite and Emerald Chemical Formula
While comparing Biotite and Emerald 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 Emerald chemical formula.
- Chemical formula of Biotite- K(Mg,Fe++)3[AlSi3O10(OH,F)2
- Chemical formula of Emerald- Be3Al2SiO6
Biotite and Emerald Specific Gravity
Another important criteria for qualitative analysis of gemstones is Biotite and Emerald Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Biotite and Emerald Optical Properties during the identification of gemstone. Specific gravity of Biotite is 2.67-2.78 whereas that of Emerald is 2.67-2.78.