Esperite and Kyanite Physical Properties
Tenacity
Not Available
  
Brittle
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
4.28-4.42
  
3.53-3.65
  
Fracture
Conchoidal, ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle, Metallic
  
Splintery, Brittle, Metallic
  
Cleavage
Distinct on [010] and [100] poor on [101]
  
[100] perfect [010] imperfect with 79° angle between
  
Mohs Hardness
5-5.5
  
4-7
  
Chemical Composition
PbCa 3Zn 4(SiO 4) 4Anthony et al , Handbook of mineralogy (2001)
  
Not Available
  
Esperite and Kyanite Chemical Formula
While comparing Esperite and Kyanite 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 Esperite and Kyanite chemical formula.
- Chemical formula of Esperite- PbCa 3Zn 4(SiO 4) 4Anthony et al , Handbook of mineralogy (2001)
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Esperite and Kyanite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Esperite and Kyanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Esperite and Kyanite Optical Properties during the identification of gemstone. Specific gravity of Esperite is 3.53-3.65 whereas that of Kyanite is 3.53-3.65.