Anorthite and Feldspar Physical Properties
Tenacity
Brittle
  
Not Available
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2.77
  
2.56-2.75
  
Fracture
Uneven, Uneven, Gems, Sixth Edition (2006)
  
Uneven, Conchoidal, Uneven, Conchoidal, Gemstones of the world (2001)
  
Cleavage
Perfect [001] good [010] poor [110]
  
two or three
  
Mohs Hardness
6-6.5
  
6-6.5
  
Chemical Composition
CaAl 2Si 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
  
Not Available
  
Anorthite and Feldspar Chemical Formula
While comparing Anorthite and Feldspar 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 Anorthite and Feldspar chemical formula.
- Chemical formula of Anorthite- CaAl 2Si 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
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Anorthite and Feldspar Specific Gravity
Another important criteria for qualitative analysis of gemstones is Anorthite and Feldspar Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Anorthite and Feldspar Optical Properties during the identification of gemstone. Specific gravity of Anorthite is 2.56-2.75 whereas that of Feldspar is 2.56-2.75.