Spodumene and Ettringite Physical Properties
Tenacity
Brittle
  
Not Available
  
Solubility
insoluble
  
Partially soluble in water
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.15-3.21
  
1.77
  
Fracture
Uneven, Subconchoidal, Gemstones (2009)
  
Not Available
  
Cleavage
Perfect prismatic, two directions {110} ∧ {1 1 0} at 87°
  
Perfect on {10 1 0}
  
Mohs Hardness
6-7
  
2-2.5
  
Chemical Composition
LiAlSi2O6
  
Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
  
Spodumene and Ettringite Chemical Formula
While comparing Spodumene and Ettringite 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 Spodumene and Ettringite chemical formula.
- Chemical formula of Spodumene- LiAlSi2O6
- Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
Spodumene and Ettringite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Spodumene and Ettringite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Spodumene and Ettringite Optical Properties during the identification of gemstone. Specific gravity of Spodumene is 1.77 whereas that of Ettringite is 1.77.