Howlite and Dallasite Physical Properties
Tenacity
Not Available
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
2.45-2.58
2.58-2.91
Fracture
UnevenArthur Thomas, Gemstones (2009), UnevenArthur Thomas, Gemstones (2009), Brittle, Conchoidal
Not Available
Cleavage
None
Not Available
Mohs Hardness
3-3.5
6.5-7
Chemical Composition
Ca 2B 5SiO 9(OH) 5Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Not Available
Howlite and Dallasite Chemical Formula
While comparing Howlite and Dallasite 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 Dallasite chemical formula.
- Chemical formula of Howlite- Ca 2B 5SiO 9(OH) 5Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
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Howlite and Dallasite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Howlite and Dallasite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Howlite and Dallasite Optical Properties during the identification of gemstone. Specific gravity of Howlite is 2.58-2.91 whereas that of Dallasite is 2.58-2.91.