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Black Opal
Black Opal

Ettringite
Ettringite



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Black Opal
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Ettringite

Black Opal and Ettringite Physical Properties

Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
1.97-2.22
Conchoidal
None
6-6.5
SiO 2 + H 2OUlrich Henn and Claudio C.
 
-
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)

Black Opal and Ettringite Chemical Formula

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

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Black Opal and Ettringite Specific Gravity

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