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Calcite
Calcite

Black Opal
Black Opal



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Calcite
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Black Opal

Calcite and Black Opal Physical Properties

Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
Brittle
Soluble
-
2.67-2.73
Conchoidal
Perfect on [10 1 1] three directions with angle of 74° 55
3
CaCO 3Ulrich Henn and Claudio C.
 
-
-
-
1.97-2.22
Conchoidal
None
6-6.5
SiO 2 + H 2OUlrich Henn and Claudio C.

Calcite and Black Opal Chemical Formula

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

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Calcite and Black Opal Specific Gravity

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