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Sellaite
Sellaite

Howlite
Howlite



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Sellaite
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Howlite

Sellaite and Howlite Physical Properties

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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
Brittle
-
-
3.14-3.16
Conchoidal
Perfect on {010} and {110}
5-5.5
MgF 2Ulrich Henn and Claudio C.
 
-
-
-
2.45-2.58
Conchoidal
None
3-3.5
Ca 2B 5SiO 9(OH) 5Michael O’Donoghue , Gems, Sixth Edition (2006) More from other references

Sellaite and Howlite Chemical Formula

While comparing Sellaite 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 Sellaite and Howlite chemical formula.

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Sellaite and Howlite Specific Gravity

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