Staurolite and Chalcedony Physical Properties
Tenacity
Brittle
  
Not Available
  
Solubility
Not Available
  
Soluble
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.7-3.8
  
2.55-2.70
  
Fracture
Subconchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle
  
Uneven, Splintery, Conchoidal, Uneven, Splintery, Conchoidal, UnevenWalter Schumann
  
Cleavage
Distinct on {010}
  
Absent
  
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.
  
SiO2
  
Staurolite and Chalcedony Chemical Formula
While comparing Staurolite and Chalcedony 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 Chalcedony chemical formula.
- Chemical formula of Staurolite- (Fe,Mg,Zn) 2Al 9(Si,Al) 4O 22(OH) 2Ulrich Henn and Claudio C.
- Chemical formula of Chalcedony- SiO2
Staurolite and Chalcedony Specific Gravity
Another important criteria for qualitative analysis of gemstones is Staurolite and Chalcedony Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Staurolite and Chalcedony Optical Properties during the identification of gemstone. Specific gravity of Staurolite is 2.55-2.70 whereas that of Chalcedony is 2.55-2.70.