Feldspar and Umbalite Physical Properties
Tenacity
Not Available
  
Not Available
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2.56-2.75
  
3.62-4.33
  
Fracture
Uneven, Conchoidal, Uneven, Conchoidal, Gemstones of the world (2001)
  
Uneven, Uneven, ConchoidalGemdat.org, Management Team (2012)
  
Cleavage
two or three
  
Not Available
  
Mohs Hardness
6-6.5
  
7-7.5
  
Chemical Composition
Not Available
  
Mg 3Al 2(SiO 4) 3 -Mn2+3Al 2(SiO 4) 3Gemdat.org , Management Team (2012)
  
Feldspar and Umbalite Chemical Formula
While comparing Feldspar and Umbalite 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 Feldspar and Umbalite chemical formula.
>- Chemical formula of Umbalite- Mg 3Al 2(SiO 4) 3 -Mn2+3Al 2(SiO 4) 3Gemdat.org , Management Team (2012)
Feldspar and Umbalite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Feldspar and Umbalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Feldspar and Umbalite Optical Properties during the identification of gemstone. Specific gravity of Feldspar is 3.62-4.33 whereas that of Umbalite is 3.62-4.33.