Onyx and Siderite Physical Properties

Onyx and Siderite Chemical Formula

While comparing Onyx 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 Onyx and Siderite chemical formula.

• Chemical formula of Onyx- SiO₂
• Chemical formula of Siderite- Fe2+ CO 3Michael O’Donoghue , Gems, Sixth Edition (2006) More from other references

Onyx and Siderite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Onyx and Siderite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Onyx and Siderite Optical Properties during the identification of gemstone. Specific gravity of Onyx is 3.83-3.89 whereas that of Siderite is 3.83-3.89.