Sillimanite and Super Seven Crystals Physical Properties
Tenacity
Tough
  
Not Available
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.20-3.26
  
2.9
  
Fracture
Splintery
  
Fibrous
  
Cleavage
{010} perfect
  
[010] Perfect, [100] Distinct, [011] Distinct
  
Mohs Hardness
6-7.5
  
2
  
Chemical Composition
Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
  
Not Available
  
Sillimanite and Super Seven Crystals Chemical Formula
While comparing Sillimanite and Super Seven Crystals 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 Sillimanite and Super Seven Crystals chemical formula.
- Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
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Sillimanite and Super Seven Crystals Specific Gravity
Another important criteria for qualitative analysis of gemstones is Sillimanite and Super Seven Crystals Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Super Seven Crystals Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 2.9 whereas that of Super Seven Crystals is 2.9.