Alunite and Moissanite Physical Properties
Tenacity
Brittle
  
Not Available
  
Solubility
Soluble
  
none
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2.6-2.9
  
3.17-3.24
  
Fracture
Conchoidal, Uneven
  
Conchoidal, ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle
  
Cleavage
On {0001}, perfect
  
(0001) indistinct
  
Mohs Hardness
3.5-4
  
9-9.5
  
Chemical Composition
KAl3(SO4)2(OH)6
  
SiCArthur Thomas , Gemstones (2009)
  
Alunite and Moissanite Chemical Formula
While comparing Alunite and Moissanite 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 Moissanite chemical formula.
- Chemical formula of Alunite- KAl3(SO4)2(OH)6
- Chemical formula of Moissanite- SiCArthur Thomas , Gemstones (2009)
Alunite and Moissanite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Alunite and Moissanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alunite and Moissanite Optical Properties during the identification of gemstone. Specific gravity of Alunite is 3.17-3.24 whereas that of Moissanite is 3.17-3.24.