Opal and Siderite Physical Properties
Tenacity
BrittleWalter Schumann
Brittle
Solubility
hot salt water
Not Available
Durability
Not Available
Not Available
Specific Gravity
1.98-2.25
3.83-3.89
Fracture
Conchoidal, Conchoidal, Gemstones of the world (2001) More from other references, Brittle
Uneven, Conchoidal, UnevenArthur Thomas, Brittle
Cleavage
None
Perfect on {01 1 1}
Mohs Hardness
5-6.5
3.5-4.5
Chemical Composition
SiO2 · nH2O
Fe2+ CO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Opal and Siderite Chemical Formula
While comparing Opal and Siderite 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 Opal and Siderite chemical formula.
- Chemical formula of Opal- SiO2 · nH2O
- Chemical formula of Siderite- Fe2+ CO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Opal and Siderite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Opal and Siderite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Opal and Siderite Optical Properties during the identification of gemstone. Specific gravity of Opal is 3.83-3.89 whereas that of Siderite is 3.83-3.89.