While comparing Pyrrhotite and Calcite 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 Pyrrhotite and Calcite chemical formula.
Another important criteria for qualitative analysis of gemstones is Pyrrhotite and Calcite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Pyrrhotite and Calcite Optical Properties during the identification of gemstone. Specific gravity of Pyrrhotite is 2.67-2.73 whereas that of Calcite is 2.67-2.73.
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