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Black Opal
Black Opal

Andradite
Andradite



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Black Opal
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Andradite

Black Opal and Andradite 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
-
-
3.70-4.10
Conchoidal, Uneven
none
6.5-7
Ca 3Fe 2(SiO 4) 3Arthur Thomas , Gemstones (2009)

Black Opal and Andradite Chemical Formula

While comparing Black Opal and Andradite 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 Andradite chemical formula.

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Black Opal and Andradite Specific Gravity

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