Helenite and Howlite Physical Properties
Tenacity
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Not Available
  
Solubility
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Not Available
  
Durability
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Specific Gravity
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2.45-2.58
  
Fracture
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UnevenArthur Thomas, Gemstones (2009), UnevenArthur Thomas, Gemstones (2009), Brittle, Conchoidal
  
Cleavage
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None
  
Mohs Hardness
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3-3.5
  
Chemical Composition
Not Available
  
Ca 2B 5SiO 9(OH) 5Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
  
Helenite and Howlite Chemical Formula
While comparing Helenite and Howlite 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 Howlite chemical formula.
>- Chemical formula of Howlite- Ca 2B 5SiO 9(OH) 5Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Helenite and Howlite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Helenite and Howlite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Helenite and Howlite Optical Properties during the identification of gemstone. Specific gravity of Helenite is 2.45-2.58 whereas that of Howlite is 2.45-2.58.