Kyanite and Andradite Physical Properties
Tenacity
Brittle
  
Brittle
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.53-3.65
  
3.70-4.10
  
Fracture
Splintery, Brittle, Metallic
  
Conchoidal, Uneven, Conchoidal, Brittle, ConchoidalArthur Thomas, Gemstones (2009)
  
Cleavage
[100] perfect [010] imperfect with 79° angle between
  
none
  
Mohs Hardness
4-7
  
6.5-7
  
Chemical Composition
Not Available
  
Ca 3Fe 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
  
Kyanite and Andradite Chemical Formula
While comparing Kyanite and Andradite 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 Kyanite and Andradite chemical formula.
>- Chemical formula of Andradite- Ca 3Fe 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
Kyanite and Andradite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Kyanite and Andradite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Kyanite and Andradite Optical Properties during the identification of gemstone. Specific gravity of Kyanite is 3.70-4.10 whereas that of Andradite is 3.70-4.10.