Carnallite and Black Opal Physical Properties

Carnallite

Black Opal

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Soluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

1.6

1.97-2.22

1.5 Fracture

Violet, Conchoidal, Brittle, Conchoidal, Brittle

ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)

1.6 Cleavage

None

Not Available

1.7 Mohs Hardness

2.5

6-6.5

1.8 Chemical Composition

KMgCl3•6(H2O)

SiO 2 + H 2OUlrich Henn and Claudio C.

Carnallite and Black Opal Chemical Formula

While comparing Carnallite 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 Carnallite and Black Opal chemical formula.

Chemical formula of Carnallite- KMgCl3•6(H2O)
Chemical formula of Black Opal- SiO 2 + H 2OUlrich Henn and Claudio C.

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Carnallite and Black Opal Specific Gravity

Another important criteria for qualitative analysis of gemstones is Carnallite and Black Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Carnallite and Black Opal Optical Properties during the identification of gemstone. Specific gravity of Carnallite is 1.97-2.22 whereas that of Black Opal is 1.97-2.22.