Diaspore and Polyhalite Physical Properties
Tenacity
Very brittle
  
Brittle
  
Solubility
insoluble
  
Soluble
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.30-3.40
  
2.78
  
Fracture
Conchoidal, Brittle, Conchoidal
  
Conchoidal, Brittle
  
Cleavage
{010} perfect, {110} distinct, {100} in traces
  
Perfect on {10 1 }; parting on {010}
  
Mohs Hardness
6.5-7
  
3.5
  
Chemical Composition
AlO(OH)Walter Schumann , Gemstones of the world (2001) More from other references
  
Not Available
  
Diaspore and Polyhalite Chemical Formula
While comparing Diaspore and Polyhalite 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 Diaspore and Polyhalite chemical formula.
- Chemical formula of Diaspore- AlO(OH)Walter Schumann , Gemstones of the world (2001) More from other references
>
Diaspore and Polyhalite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Diaspore and Polyhalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Diaspore and Polyhalite Optical Properties during the identification of gemstone. Specific gravity of Diaspore is 2.78 whereas that of Polyhalite is 2.78.