Riebeckite and Staurolite Physical Properties
Tenacity
Brittle
  
Brittle
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.28-3.44
  
3.7-3.8
  
Fracture
Uneven, Splintery, Brittle
  
Subconchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle
  
Cleavage
Perfect on {110}, intersecting at 56° and 124°; partings on {100} and {010}
  
Distinct on {010}
  
Mohs Hardness
5.0-6.0
  
7-7.5
  
Chemical Composition
Not Available
  
(Fe,Mg,Zn) 2Al 9(Si,Al) 4O 22(OH) 2Ulrich Henn and Claudio C.
  
Riebeckite and Staurolite Chemical Formula
While comparing Riebeckite and Staurolite 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 Staurolite chemical formula.
>- Chemical formula of Staurolite- (Fe,Mg,Zn) 2Al 9(Si,Al) 4O 22(OH) 2Ulrich Henn and Claudio C.
Riebeckite and Staurolite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Riebeckite and Staurolite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Riebeckite and Staurolite Optical Properties during the identification of gemstone. Specific gravity of Riebeckite is 3.7-3.8 whereas that of Staurolite is 3.7-3.8.