Precious Opal and Austinite Physical Properties
Tenacity
Not Available
  
Brittle
  
Solubility
Not Available
  
Easily soluble in cold dilute HCl
  
Durability
Not Available
  
Not Available
  
Specific Gravity
1.98-2.25
  
4.12
  
Fracture
Conchoidal, Conchoidal, Gemstones of the world (2001) More from other references
  
Brittle, Uneven, Brittle, Uneven
  
Cleavage
Not Available
  
Good in two directions parallel to the prism faces {110}
  
Mohs Hardness
5-6.5
  
4-4.5
  
Chemical Composition
SiO 2 · nH 2OGemdat.org , Management Team (2012)
  
CaZn(AsO4)(OH)
  
Precious Opal and Austinite Chemical Formula
While comparing Precious Opal and Austinite 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 Precious Opal and Austinite chemical formula.
- Chemical formula of Precious Opal- SiO 2 · nH 2OGemdat.org , Management Team (2012)
- Chemical formula of Austinite- CaZn(AsO4)(OH)
Precious Opal and Austinite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Precious Opal and Austinite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Precious Opal and Austinite Optical Properties during the identification of gemstone. Specific gravity of Precious Opal is 4.12 whereas that of Austinite is 4.12.