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Howlite
Howlite

Covellite
Covellite



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Howlite
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Covellite

Howlite and Covellite Physical Properties

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1 Physical Properties
1.1 Tenacity
Not Available
Flexible
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
2.45-2.584.6-4.76
Amber
1 7.18
1.5 Fracture
UnevenArthur Thomas, Gemstones (2009), UnevenArthur Thomas, Gemstones (2009), Brittle, Conchoidal
Gemstones (2009), UnevenArthur Thomas, Gemstones (2009), Brittle, Metallic
1.6 Cleavage
None
Perfect on {0001}
1.7 Mohs Hardness
3-3.5Not Available
Amber
2 10
1.8 Chemical Composition
Ca 2B 5SiO 9(OH) 5Michael O’Donoghue , Gems, Sixth Edition (2006) More from other references
CuSMichael O’Donoghue , Gems, Sixth edition (2006) More from other references

Howlite and Covellite Chemical Formula

While comparing Howlite and Covellite 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 Howlite and Covellite chemical formula.

  • Chemical formula of Howlite- Ca 2B 5SiO 9(OH) 5Michael O’Donoghue , Gems, Sixth Edition (2006) More from other references
  • Chemical formula of Covellite- CuSMichael O’Donoghue , Gems, Sixth edition (2006) More from other references

Howlite and Covellite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Howlite and Covellite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Howlite and Covellite Optical Properties during the identification of gemstone. Specific gravity of Howlite is 4.6-4.76 whereas that of Covellite is 4.6-4.76.