Black Opal and Polyhalite Physical Properties

Black Opal and Polyhalite Chemical Formula

While comparing Black Opal and Polyhalite 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 Black Opal and Polyhalite chemical formula.

• Chemical formula of Black Opal- SiO 2 + H 2OUlrich Henn and Claudio C.
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Black Opal and Polyhalite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Black Opal and Polyhalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Black Opal and Polyhalite Optical Properties during the identification of gemstone. Specific gravity of Black Opal is 2.78 whereas that of Polyhalite is 2.78.