Mottramite and Dravite Physical Properties
Tenacity
Brittle
  
Not Available
  
Solubility
Soluble
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
5.9
  
3.03-3.18
  
Fracture
Sub-Conchoidal, Brittle, Metallic
  
Uneven, Uneven, Irregular, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle
  
Cleavage
None observed
  
{???} Indistinct
  
Mohs Hardness
3
  
7-7.5
  
Chemical Composition
Not Available
  
Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
  
Mottramite and Dravite Chemical Formula
While comparing Mottramite and Dravite 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 Dravite chemical formula.
>- Chemical formula of Dravite- Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
Mottramite and Dravite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Mottramite and Dravite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Mottramite and Dravite Optical Properties during the identification of gemstone. Specific gravity of Mottramite is 3.03-3.18 whereas that of Dravite is 3.03-3.18.