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Ettringite
Ettringite

Common Opal
Common Opal



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Ettringite
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Common Opal

Ettringite and Common Opal Physical Properties

Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
Partially soluble in water
-
1.77
-
Perfect on {10 1 0}
2-2.5
Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael O’Donoghue , Gems, Sixth Edition (2006)
 
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-
-
1.98-2.50
Conchoidal
None
5.5-6.5
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)

Ettringite and Common Opal Chemical Formula

While comparing Ettringite and Common Opal 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 Ettringite and Common Opal chemical formula.

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Ettringite and Common Opal Specific Gravity

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