Ulexite and Opal Physical Properties
Tenacity
Not Available
  
BrittleWalter Schumann
  
Solubility
Not Available
  
hot salt water
  
Durability
Not Available
  
Not Available
  
Specific Gravity
1.65-1.99
  
1.98-2.25
  
Fracture
UnevenAnthony et al, Uneven, UnevenAnthony et al, Uneven, Brittle, Metallic
  
Conchoidal, Conchoidal, Gemstones of the world (2001) More from other references, Brittle
  
Cleavage
{010} Perfect, {110} Perfect
  
None
  
Mohs Hardness
2-2.5
  
5-6.5
  
Chemical Composition
NaCaB 5O 6(OH) 6 · 5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
  
SiO2 · nH2O
  
Ulexite and Opal Chemical Formula
While comparing Ulexite and Opal 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 Ulexite and Opal chemical formula.
- Chemical formula of Ulexite- NaCaB 5O 6(OH) 6 · 5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
- Chemical formula of Opal- SiO2 · nH2O
Ulexite and Opal Specific Gravity
Another important criteria for qualitative analysis of gemstones is Ulexite and Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Ulexite and Opal Optical Properties during the identification of gemstone. Specific gravity of Ulexite is 1.98-2.25 whereas that of Opal is 1.98-2.25.