Obsidian and Purpurite Physical Properties
Tenacity
Not Available
  
Not Available
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2.35-2.60
  
3.2-3.4
  
Fracture
Conchoidal, ConchoidalWalter Schumann, Conchoidal
  
Uneven, UnevenArthur Thomas, Gemstones (2009), Brittle
  
Cleavage
Not Available
  
[100] [001] perfect
  
Mohs Hardness
5-5.5
  
4-4.5
  
Chemical Composition
Not Available
  
MnPO 4Walter Schumann , Gemstones of the world (2001) More from other references
  
Obsidian and Purpurite Chemical Formula
While comparing Obsidian and Purpurite 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 Obsidian and Purpurite chemical formula.
>- Chemical formula of Purpurite- MnPO 4Walter Schumann , Gemstones of the world (2001) More from other references
Obsidian and Purpurite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Obsidian and Purpurite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Obsidian and Purpurite Optical Properties during the identification of gemstone. Specific gravity of Obsidian is 3.2-3.4 whereas that of Purpurite is 3.2-3.4.