Ettringite and Hollandite Physical Properties
Tenacity
Not Available
  
Not Available
  
Solubility
Partially soluble in water
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
1.77
  
5.05
  
Fracture
Not Available
  
Brittle, Metallic
  
Cleavage
Perfect on {10 1 0}
  
Distinct / Good, Prismatic
  
Mohs Hardness
2-2.5
  
4-6
  
Chemical Composition
Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
  
Ba(Mn++++,Mn++)8O16
  
Ettringite and Hollandite Chemical Formula
While comparing Ettringite 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 Ettringite and Hollandite chemical formula.
- Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
- Chemical formula of Hollandite- Ba(Mn++++,Mn++)8O16
Ettringite and Hollandite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Ettringite and Hollandite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Ettringite and Hollandite Optical Properties during the identification of gemstone. Specific gravity of Ettringite is 5.05 whereas that of Hollandite is 5.05.