Piemontite and Black Opal Physical Properties

Piemontite

Black Opal

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

Not Available1.97-2.22

1 7.18

1.5 Fracture

Uneven, Splintery

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

1.6 Cleavage

[001] good, [100] distinct

Not Available

1.7 Mohs Hardness

6-6.56-6.5

2 10

1.8 Chemical Composition

Not Available

SiO 2 + H 2OUlrich Henn and Claudio C.

Piemontite and Black Opal Chemical Formula

While comparing Piemontite 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 Piemontite and Black Opal chemical formula.

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

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Piemontite and Black Opal Specific Gravity

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