London blue topaz and Phosphosiderite Physical Properties
Tenacity
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Solubility
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Durability
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Specific Gravity
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2.74-2.76
  
Fracture
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UnevenAnthony et al, Handbook of mineralogy (2001), UnevenAnthony et al, Handbook of mineralogy (2001), Uneven
  
Cleavage
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{010} Perfect, {001} Distinct
  
Mohs Hardness
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3.5-4
  
Chemical Composition
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Fe3+ PO 4 · 2H 2OAnthony et al , Handbook of Mineralogy (2001)
  
London blue topaz and Phosphosiderite Chemical Formula
While comparing London blue topaz and Phosphosiderite 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 Phosphosiderite chemical formula.
>- Chemical formula of Phosphosiderite- Fe3+ PO 4 · 2H 2OAnthony et al , Handbook of Mineralogy (2001)
London blue topaz and Phosphosiderite Specific Gravity
Another important criteria for qualitative analysis of gemstones is London blue topaz and Phosphosiderite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use London blue topaz and Phosphosiderite Optical Properties during the identification of gemstone. Specific gravity of London blue topaz is 2.74-2.76 whereas that of Phosphosiderite is 2.74-2.76.