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