Riebeckite and Stibiotantalite Physical Properties
Tenacity
Brittle
  
Not Available
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.28-3.44
  
Not Available
  
Fracture
Uneven, Splintery, Brittle
  
ConchoidalAnthony et al, Handbook of mineralogy (2001), ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle, Conchoidal
  
Cleavage
Perfect on {110}, intersecting at 56° and 124°; partings on {100} and {010}
  
{???} Perfect
  
Mohs Hardness
5.0-6.0
  
5.5-6
  
Chemical Composition
Not Available
  
SbTaO 4Ulrich Henn and Claudio C.
  
Riebeckite and Stibiotantalite Chemical Formula
While comparing Riebeckite and Stibiotantalite 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 Riebeckite and Stibiotantalite chemical formula.
>- Chemical formula of Stibiotantalite- SbTaO 4Ulrich Henn and Claudio C.
Riebeckite and Stibiotantalite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Riebeckite and Stibiotantalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Riebeckite and Stibiotantalite Optical Properties during the identification of gemstone. Specific gravity of Riebeckite is Not Available whereas that of Stibiotantalite is Not Available.