Pietersite and Chlorastrolite Physical Properties
Tenacity
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Solubility
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Durability
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Specific Gravity
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3.1-3.5
  
Fracture
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Granular
  
Cleavage
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Mohs Hardness
5
  
5-6
  
Chemical Composition
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Ca 2(Mg,Fe)Al 2(SiO 4)(Si 2O 7)(OH) 2 · H 2O)Arthur Thomas , Gemstones (2009)
  
Pietersite and Chlorastrolite Chemical Formula
While comparing Pietersite and Chlorastrolite 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 Pietersite and Chlorastrolite chemical formula.
>- Chemical formula of Chlorastrolite- Ca 2(Mg,Fe)Al 2(SiO 4)(Si 2O 7)(OH) 2 · H 2O)Arthur Thomas , Gemstones (2009)
Pietersite and Chlorastrolite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Pietersite and Chlorastrolite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Pietersite and Chlorastrolite Optical Properties during the identification of gemstone. Specific gravity of Pietersite is 3.1-3.5 whereas that of Chlorastrolite is 3.1-3.5.