Hollandite and Black Opal Physical Properties
Tenacity
Not Available
  
Not Available
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
5.05
  
1.97-2.22
  
Fracture
Brittle, Metallic
  
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
  
Cleavage
Distinct / Good, Prismatic
  
Not Available
  
Mohs Hardness
4-6
  
6-6.5
  
Chemical Composition
Ba(Mn++++,Mn++)8O16
  
SiO 2 + H 2OUlrich Henn and Claudio C.
  
Hollandite and Black Opal Chemical Formula
While comparing Hollandite and Black 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 Hollandite and Black Opal chemical formula.
- Chemical formula of Hollandite- Ba(Mn++++,Mn++)8O16
- Chemical formula of Black Opal- SiO 2 + H 2OUlrich Henn and Claudio C.
Hollandite and Black Opal Specific Gravity
Another important criteria for qualitative analysis of gemstones is Hollandite and Black Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Hollandite and Black Opal Optical Properties during the identification of gemstone. Specific gravity of Hollandite is 1.97-2.22 whereas that of Black Opal is 1.97-2.22.