Andalusite and Sylvite Physical Properties
Tenacity
Not Available
  
Brittle
  
Solubility
Not Available
  
Soluble
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.05-3.21
  
1.993
  
Fracture
Uneven, Subconchoidal, Uneven, Subconchoidal, Splintery, UnevenArthur Thomas, Gemstones (2009)
  
Uneven, Brittle
  
Cleavage
Good on {110}, poor on {100}
  
Perfect on [100], [010], [001]
  
Mohs Hardness
7.5
  
2.5
  
Chemical Composition
Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
  
Not Available
  
Andalusite and Sylvite Chemical Formula
While comparing Andalusite and Sylvite 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 Andalusite and Sylvite chemical formula.
- Chemical formula of Andalusite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
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Andalusite and Sylvite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Andalusite and Sylvite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Andalusite and Sylvite Optical Properties during the identification of gemstone. Specific gravity of Andalusite is 1.993 whereas that of Sylvite is 1.993.