London blue topaz and Nosean Physical Properties

London blue topaz and Nosean Chemical Formula

While comparing London blue topaz and Nosean 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 London blue topaz and Nosean chemical formula.

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• Chemical formula of Nosean- Na 8Al 6Si 6O 24(SO 4) · H 2OAnthony et al , Handbook of Mineralogy (2001)

London blue topaz and Nosean Specific Gravity

Another important criteria for qualitative analysis of gemstones is London blue topaz and Nosean Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use London blue topaz and Nosean Optical Properties during the identification of gemstone. Specific gravity of London blue topaz is 2.30-2.40 whereas that of Nosean is 2.30-2.40.