Fluorapatite and Alunite Physical Properties
Tenacity
Not Available
  
Brittle
  
Solubility
Not Available
  
Soluble
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.1-3.25
  
2.6-2.9
  
Fracture
Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001)
  
Conchoidal, Uneven
  
Cleavage
Indistinct
  
On {0001}, perfect
  
Mohs Hardness
5
  
3.5-4
  
Chemical Composition
Ca 5(PO 4) 3FAnthony et al , Handbook of mineralogy (2001)
  
KAl3(SO4)2(OH)6
  
Fluorapatite and Alunite Chemical Formula
While comparing Fluorapatite 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 Fluorapatite and Alunite chemical formula.
- Chemical formula of Fluorapatite- Ca 5(PO 4) 3FAnthony et al , Handbook of mineralogy (2001)
- Chemical formula of Alunite- KAl3(SO4)2(OH)6
Fluorapatite and Alunite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Fluorapatite and Alunite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Fluorapatite and Alunite Optical Properties during the identification of gemstone. Specific gravity of Fluorapatite is 2.6-2.9 whereas that of Alunite is 2.6-2.9.