Star Ruby and Alunite Physical Properties
Tenacity
Not Available
  
Brittle
  
Solubility
Not Available
  
Soluble
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.95-4.10
  
2.6-2.9
  
Fracture
Uneven, Uneven, Gems, Sixth Edition (2006)
  
Conchoidal, Uneven
  
Cleavage
Not Available
  
On {0001}, perfect
  
Mohs Hardness
Not Available
  
3.5-4
  
Chemical Composition
Al 2O 3Michael OâDonoghue , Gems, Sixth Edition (2006)
  
KAl3(SO4)2(OH)6
  
Star Ruby and Alunite Chemical Formula
While comparing Star Ruby and Alunite 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 Star Ruby and Alunite chemical formula.
- Chemical formula of Star Ruby- Al 2O 3Michael OâDonoghue , Gems, Sixth Edition (2006)
- Chemical formula of Alunite- KAl3(SO4)2(OH)6
Star Ruby and Alunite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Star Ruby and Alunite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Star Ruby and Alunite Optical Properties during the identification of gemstone. Specific gravity of Star Ruby is 2.6-2.9 whereas that of Alunite is 2.6-2.9.