Staurolite and Dallasite Physical Properties
Tenacity
Brittle
  
Not Available
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.7-3.8
  
2.58-2.91
  
Fracture
Subconchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle
  
Not Available
  
Cleavage
Distinct on {010}
  
Not Available
  
Mohs Hardness
7-7.5
  
6.5-7
  
Chemical Composition
(Fe,Mg,Zn) 2Al 9(Si,Al) 4O 22(OH) 2Ulrich Henn and Claudio C.
  
Not Available
  
Staurolite and Dallasite Chemical Formula
While comparing Staurolite and Dallasite 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 Staurolite and Dallasite chemical formula.
- Chemical formula of Staurolite- (Fe,Mg,Zn) 2Al 9(Si,Al) 4O 22(OH) 2Ulrich Henn and Claudio C.
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Staurolite and Dallasite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Staurolite and Dallasite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Staurolite and Dallasite Optical Properties during the identification of gemstone. Specific gravity of Staurolite is 2.58-2.91 whereas that of Dallasite is 2.58-2.91.