Tourmaline and Black Opal Physical Properties

Tourmaline

Black Opal

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.85-3.351.97-2.22

1 7.18

1.5 Fracture

Uneven, Conchoidal, ConchoidalArthur Thomas, Gemstones (2009)

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

1.6 Cleavage

Indistinct

Not Available

1.7 Mohs Hardness

7-7.56-6.5

2 10

1.8 Chemical Composition

Tourmaline is a series of several different minerals with unique chemical formulas. See The chemical formula of Tourmaline for details.

SiO 2 + H 2OUlrich Henn and Claudio C.

Tourmaline and Black Opal Chemical Formula

While comparing Tourmaline 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 Tourmaline and Black Opal chemical formula.

Chemical formula of Tourmaline- Tourmaline is a series of several different minerals with unique chemical formulas. See The chemical formula of Tourmaline for details.
Chemical formula of Black Opal- SiO 2 + H 2OUlrich Henn and Claudio C.

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Tourmaline and Black Opal Specific Gravity

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