Boulder Opal and Smoky Quartz Physical Properties
Tenacity
Not Available
  
Brittle
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
1.98-2.25
  
2.65
  
Fracture
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
  
Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001)
  
Cleavage
Not Available
  
{0110} Indistinct
  
Mohs Hardness
5-6.5
  
7
  
Chemical Composition
SiO 2 + H 2OUlrich Henn and Claudio C.
  
SiO2
  
Boulder Opal and Smoky Quartz Chemical Formula
While comparing Boulder Opal and Smoky Quartz 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 Boulder Opal and Smoky Quartz chemical formula.
- Chemical formula of Boulder Opal- SiO 2 + H 2OUlrich Henn and Claudio C.
- Chemical formula of Smoky Quartz- SiO2
Boulder Opal and Smoky Quartz Specific Gravity
Another important criteria for qualitative analysis of gemstones is Boulder Opal and Smoky Quartz Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Boulder Opal and Smoky Quartz Optical Properties during the identification of gemstone. Specific gravity of Boulder Opal is 2.65 whereas that of Smoky Quartz is 2.65.