Biotite and Agate Opal Physical Properties
Tenacity
Brittle
  
Not Available
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2.7-3.3
  
1.98-2.50
  
Fracture
Uneven, Even, Yellow, White
  
Conchoidal, Conchoidal, Gemstones of the world (2001)
  
Cleavage
Perfect on the {001}
  
Not Available
  
Mohs Hardness
2.5-3.0
  
5.5-6.5
  
Chemical Composition
K(Mg,Fe++)3[AlSi3O10(OH,F)2
  
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
  
Biotite and Agate Opal Chemical Formula
While comparing Biotite and Agate Opal 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 Agate Opal chemical formula.
- Chemical formula of Biotite- K(Mg,Fe++)3[AlSi3O10(OH,F)2
- Chemical formula of Agate Opal- SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
Biotite and Agate Opal Specific Gravity
Another important criteria for qualitative analysis of gemstones is Biotite and Agate Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Biotite and Agate Opal Optical Properties during the identification of gemstone. Specific gravity of Biotite is 1.98-2.50 whereas that of Agate Opal is 1.98-2.50.