Onyx and Uvite Physical Properties
Tenacity
Not Available
  
Not Available
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2.55-2.70
  
2.97-3.14
  
Fracture
Not Available
  
Uneven, Conchoidal, Brittle
  
Cleavage
Indiscernible
  
{1011} Indistinct
  
Mohs Hardness
6.5-7
  
Not Available
  
Chemical Composition
SiO2
  
Ca(Mg 3)MgAl 5(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
  
Onyx and Uvite Chemical Formula
While comparing Onyx and Uvite 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 Onyx and Uvite chemical formula.
- Chemical formula of Onyx- SiO2
- Chemical formula of Uvite- Ca(Mg 3)MgAl 5(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
Onyx and Uvite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Onyx and Uvite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Onyx and Uvite Optical Properties during the identification of gemstone. Specific gravity of Onyx is 2.97-3.14 whereas that of Uvite is 2.97-3.14.