Selenite and Jet Physical Properties
Tenacity
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Solubility
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Durability
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Specific Gravity
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1.19-1.35
  
Fracture
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ConchoidalWalter Schumann, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references
  
Cleavage
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Mohs Hardness
2
  
2.5-4
  
Chemical Composition
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Selenite and Jet Chemical Formula
While comparing Selenite and Jet 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 Selenite and Jet chemical formula.
Selenite and Jet Specific Gravity
Another important criteria for qualitative analysis of gemstones is Selenite and Jet Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Selenite and Jet Optical Properties during the identification of gemstone. Specific gravity of Selenite is 1.19-1.35 whereas that of Jet is 1.19-1.35.