While comparing Boulder Opal and Almandine 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 Boulder Opal and Almandine chemical formula.
Another important criteria for qualitative analysis of gemstones is Boulder Opal and Almandine Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Boulder Opal and Almandine Optical Properties during the identification of gemstone. Specific gravity of Boulder Opal is 3.95-4.30 whereas that of Almandine is 3.95-4.30.
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