Sulfur and Opal Physical Properties
Tenacity
Not Available
  
BrittleWalter Schumann
  
Solubility
insoluble
  
hot salt water
  
Durability
Not Available
  
Not Available
  
Specific Gravity
Not Available
  
1.98-2.25
  
Fracture
(e.g. graphite).
  
Conchoidal, Conchoidal, Gemstones of the world (2001) More from other references, Brittle
  
Cleavage
{???} Imperfect, {???} Imperfect
  
None
  
Mohs Hardness
Not Available
  
5-6.5
  
Chemical Composition
Not Available
  
SiO2 · nH2O
  
Sulfur and Opal Chemical Formula
While comparing Sulfur 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 Sulfur and Opal chemical formula.
>- Chemical formula of Opal- SiO2 · nH2O
Sulfur and Opal Specific Gravity
Another important criteria for qualitative analysis of gemstones is Sulfur and Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sulfur and Opal Optical Properties during the identification of gemstone. Specific gravity of Sulfur is 1.98-2.25 whereas that of Opal is 1.98-2.25.