Mottramite and Gahnite Physical Properties
Tenacity
Brittle
  
Not Available
  
Solubility
Soluble
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
5.9
  
4.00-4.62
  
Fracture
Sub-Conchoidal, Brittle, Metallic
  
Conchoidal, Uneven
  
Cleavage
None observed
  
Indistinct parting on [111]
  
Mohs Hardness
3
  
7.5-8
  
Chemical Composition
Not Available
  
ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)
  
Mottramite and Gahnite Chemical Formula
While comparing Mottramite and Gahnite 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 Mottramite and Gahnite chemical formula.
>- Chemical formula of Gahnite- ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)
Mottramite and Gahnite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Mottramite and Gahnite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Mottramite and Gahnite Optical Properties during the identification of gemstone. Specific gravity of Mottramite is 4.00-4.62 whereas that of Gahnite is 4.00-4.62.