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Grossular
Grossular

Black Opal
Black Opal



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Grossular
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Black Opal

Grossular and Black Opal Physical Properties

Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
3.55-3.73
Conchoidal, Uneven
none
7-7.5
Ca 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
 
-
-
-
1.97-2.22
Conchoidal
None
6-6.5
SiO 2 + H 2OUlrich Henn and Claudio C.

Grossular and Black Opal Chemical Formula

While comparing Grossular 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 Grossular and Black Opal chemical formula.

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Grossular and Black Opal Specific Gravity

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