Staurolite and Sylvite Physical Properties
Tenacity
Brittle
  
Brittle
  
Solubility
Not Available
  
Soluble
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.7-3.8
  
1.993
  
Fracture
Subconchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle
  
Uneven, Brittle
  
Cleavage
Distinct on {010}
  
Perfect on [100], [010], [001]
  
Mohs Hardness
7-7.5
  
2.5
  
Chemical Composition
(Fe,Mg,Zn) 2Al 9(Si,Al) 4O 22(OH) 2Ulrich Henn and Claudio C.
  
Not Available
  
Staurolite and Sylvite Chemical Formula
While comparing Staurolite and Sylvite 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 Sylvite 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 Sylvite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Staurolite and Sylvite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Staurolite and Sylvite Optical Properties during the identification of gemstone. Specific gravity of Staurolite is 1.993 whereas that of Sylvite is 1.993.