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Black Opal
Black Opal

Anorthite
Anorthite



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Black Opal
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Anorthite

Black Opal and Anorthite 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.
 
Brittle
-
-
2.77
Uneven
Perfect [001] good [010] poor [110]
6-6.5
CaAl 2Si 2O 8Michael O’Donoghue , Gems, Sixth Edition (2006)

Black Opal and Anorthite Chemical Formula

While comparing Black Opal and Anorthite 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 Anorthite chemical formula.

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Black Opal and Anorthite Specific Gravity

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