Helenite and Bertrandite Physical Properties
Tenacity
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Solubility
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Durability
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Specific Gravity
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2.59-2.60
  
Fracture
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Brittle, Metallic, Brittle, Metallic
  
Cleavage
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{001} Perfect, {110} Distinct, {101} Distinct
  
Mohs Hardness
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6-7
  
Chemical Composition
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Be 4Si 2O 7(OH) 2Anthony et al , Handbook of mineralogy (2001)
  
Helenite and Bertrandite Chemical Formula
While comparing Helenite and Bertrandite 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 Helenite and Bertrandite chemical formula.
>- Chemical formula of Bertrandite- Be 4Si 2O 7(OH) 2Anthony et al , Handbook of mineralogy (2001)
Helenite and Bertrandite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Helenite and Bertrandite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Helenite and Bertrandite Optical Properties during the identification of gemstone. Specific gravity of Helenite is 2.59-2.60 whereas that of Bertrandite is 2.59-2.60.