Grandidierite and Obsidian Physical Properties
Tenacity
Not Available
  
Not Available
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2.85-3.00
  
2.35-2.60
  
Fracture
Brittle, UnevenArthur Thomas, Gemstones (2009), Brittle, Uneven
  
Conchoidal, ConchoidalWalter Schumann, Conchoidal
  
Cleavage
Perfect
  
Not Available
  
Mohs Hardness
7.5
  
5-5.5
  
Chemical Composition
(Mg,Fe)Al 3(BO 4)(SiO 4)OUlrich Henn and Claudio C.
  
Not Available
  
Grandidierite and Obsidian Chemical Formula
While comparing Grandidierite and Obsidian 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 Grandidierite and Obsidian chemical formula.
- Chemical formula of Grandidierite- (Mg,Fe)Al 3(BO 4)(SiO 4)OUlrich Henn and Claudio C.
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Grandidierite and Obsidian Specific Gravity
Another important criteria for qualitative analysis of gemstones is Grandidierite and Obsidian Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Grandidierite and Obsidian Optical Properties during the identification of gemstone. Specific gravity of Grandidierite is 2.35-2.60 whereas that of Obsidian is 2.35-2.60.