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Opal
Opal

Anorthite
Anorthite



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Opal
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Opal and Anorthite Physical Properties

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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
BrittleWalter Schumann
hot salt water
-
1.98-2.25
Conchoidal
None
5-6.5
SiO2 · nH2O
 
Brittle
-
-
2.77
Uneven
Perfect [001] good [010] poor [110]
6-6.5
CaAl 2Si 2O 8Michael O’Donoghue , Gems, Sixth Edition (2006)

Opal and Anorthite Chemical Formula

While comparing 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 Opal and Anorthite chemical formula.

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Opal and Anorthite Specific Gravity

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