Siderite and Precious Opal Physical Properties
Tenacity
Brittle
  
Not Available
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.83-3.89
  
1.98-2.25
  
Fracture
Uneven, Conchoidal, UnevenArthur Thomas, Brittle
  
Conchoidal, Conchoidal, Gemstones of the world (2001) More from other references
  
Cleavage
Perfect on {01 1 1}
  
Not Available
  
Mohs Hardness
3.5-4.5
  
5-6.5
  
Chemical Composition
Fe2+ CO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
  
SiO 2 · nH 2OGemdat.org , Management Team (2012)
  
Siderite and Precious Opal Chemical Formula
While comparing Siderite and Precious 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 Siderite and Precious Opal chemical formula.
- Chemical formula of Siderite- Fe2+ CO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
- Chemical formula of Precious Opal- SiO 2 · nH 2OGemdat.org , Management Team (2012)
Siderite and Precious Opal Specific Gravity
Another important criteria for qualitative analysis of gemstones is Siderite and Precious Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Siderite and Precious Opal Optical Properties during the identification of gemstone. Specific gravity of Siderite is 1.98-2.25 whereas that of Precious Opal is 1.98-2.25.