Alunite and Jade Physical Properties
Tenacity
Brittle
  
Not Available
  
Solubility
Soluble
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2.6-2.9
  
2.90-3.38
  
Fracture
Conchoidal, Uneven
  
Gemstones of the world (2001), Difficult, Splintery
  
Cleavage
On {0001}, perfect
  
1 or 2,2 prismatic.
  
Mohs Hardness
3.5-4
  
6-7
  
Chemical Composition
KAl3(SO4)2(OH)6
  
Nephrite: Ca2(Mg,Fe)5Si8O22(OH)2 Jadeite: NaAlSi2O6
  
Alunite and Jade Chemical Formula
While comparing Alunite and Jade 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 Jade chemical formula.
- Chemical formula of Alunite- KAl3(SO4)2(OH)6
- Chemical formula of Jade- Nephrite: Ca2(Mg,Fe)5Si8O22(OH)2 Jadeite: NaAlSi2O6
Alunite and Jade Specific Gravity
Another important criteria for qualitative analysis of gemstones is Alunite and Jade Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alunite and Jade Optical Properties during the identification of gemstone. Specific gravity of Alunite is 2.90-3.38 whereas that of Jade is 2.90-3.38.