London blue topaz and Jacobsite Physical Properties
Tenacity
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Solubility
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Durability
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Specific Gravity
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4.76-5.03
  
Fracture
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Conchoidal, Brittle
  
Cleavage
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None
  
Mohs Hardness
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5.5-6.5
  
Chemical Composition
Not Available
  
(Mn2+ ,Fe2+ ,Mg)(Fe3+ ,Mn3+ ) 2O 4Anthony et al , Handbook of mineralogy (2001)
  
London blue topaz and Jacobsite Chemical Formula
While comparing London blue topaz and Jacobsite 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 Jacobsite chemical formula.
>- Chemical formula of Jacobsite- (Mn2+ ,Fe2+ ,Mg)(Fe3+ ,Mn3+ ) 2O 4Anthony et al , Handbook of mineralogy (2001)
London blue topaz and Jacobsite Specific Gravity
Another important criteria for qualitative analysis of gemstones is London blue topaz and Jacobsite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use London blue topaz and Jacobsite Optical Properties during the identification of gemstone. Specific gravity of London blue topaz is 4.76-5.03 whereas that of Jacobsite is 4.76-5.03.