Rosasite and Black Opal Physical Properties

Rosasite

Black Opal

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Effervesces in cold

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

4-4.21.97-2.22

1 7.18

1.5 Fracture

Splintery

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

1.6 Cleavage

Perfect on {100} and {010}

Not Available

1.7 Mohs Hardness

46-6.5

2 10

1.8 Chemical Composition

Not Available

SiO 2 + H 2OUlrich Henn and Claudio C.

Rosasite and Black Opal Chemical Formula

While comparing Rosasite 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 Rosasite and Black Opal chemical formula.

Chemical formula of Black Opal- SiO 2 + H 2OUlrich Henn and Claudio C.

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Rosasite and Black Opal Specific Gravity

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