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Howlite
Howlite

Polyhalite
Polyhalite



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Howlite
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Polyhalite

Howlite and Polyhalite Physical Properties

1 Physical Properties
1.1 Tenacity
Not Available
Brittle
1.2 Solubility
Not Available
Soluble
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
2.45-2.582.78
Amber
1 7.18
1.5 Fracture
UnevenArthur Thomas, Gemstones (2009), UnevenArthur Thomas, Gemstones (2009), Brittle, Conchoidal
Conchoidal, Brittle
1.6 Cleavage
None
Perfect on {10 1 }; parting on {010}
1.7 Mohs Hardness
3-3.53.5
Amber
2 10
1.8 Chemical Composition
Ca 2B 5SiO 9(OH) 5Michael O’Donoghue , Gems, Sixth Edition (2006) More from other references
Not Available

Howlite and Polyhalite Chemical Formula

While comparing Howlite and Polyhalite 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 Polyhalite chemical formula.

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

Another important criteria for qualitative analysis of gemstones is Howlite and Polyhalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Howlite and Polyhalite Optical Properties during the identification of gemstone. Specific gravity of Howlite is 2.78 whereas that of Polyhalite is 2.78.