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Sapphire
Sapphire

Howlite
Howlite



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Sapphire
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Howlite

Sapphire and Howlite Physical Properties

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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
insoluble
-
3.95-4.03
Uneven
None, but may exhibit parting
9
Al 2 O 3
 
-
-
-
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

Sapphire and Howlite Chemical Formula

While comparing Sapphire 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 Sapphire and Howlite chemical formula.

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Sapphire and Howlite Specific Gravity

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