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Black Opal
Black Opal

Faustite
Faustite



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Black Opal
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Faustite

Black Opal and Faustite 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.
 
-
-
-
2.9
Conchoidal
{???} Indistinct
4.5
(Zn,Cu)Al 6(PO 4) 4(OH) 8 · 4H 2OMichael O’Donoghue , Gems, Sixth Edition (2006)

Black Opal and Faustite Chemical Formula

While comparing Black Opal and Faustite 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 Faustite chemical formula.

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Black Opal and Faustite Specific Gravity

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