Alunite and Fluorite Physical Properties
Tenacity
Brittle
  
Brittle
  
Solubility
Soluble
  
slightly water soluble and in hot hydrochloric acid
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2.6-2.9
  
3.00-3.25
  
Fracture
Conchoidal, Uneven
  
Subconchoidal, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references
  
Cleavage
On {0001}, perfect
  
Octahedral, perfect on {111}, parting on {011}
  
Mohs Hardness
3.5-4
  
4
  
Chemical Composition
KAl3(SO4)2(OH)6
  
CaF2
  
Alunite and Fluorite Chemical Formula
While comparing Alunite and Fluorite 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 Alunite and Fluorite chemical formula.
- Chemical formula of Alunite- KAl3(SO4)2(OH)6
- Chemical formula of Fluorite- CaF2
Alunite and Fluorite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Alunite and Fluorite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alunite and Fluorite Optical Properties during the identification of gemstone. Specific gravity of Alunite is 3.00-3.25 whereas that of Fluorite is 3.00-3.25.