Hematite and Black Opal Physical Properties

Hematite

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

5.00-5.301.97-2.22

1 7.18

1.5 Fracture

Uneven, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references, Conchoidal, Brittle

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

1.6 Cleavage

None, may show partings on {0001} and {10 1 1}

Not Available

1.7 Mohs Hardness

66-6.5

2 10

1.8 Chemical Composition

Fe 2O 3Arthur Thomas , Gemstones (2009)

SiO 2 + H 2OUlrich Henn and Claudio C.

Hematite and Black Opal Chemical Formula

While comparing Hematite 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 Hematite and Black Opal chemical formula.

Chemical formula of Hematite- Fe 2O 3Arthur Thomas , Gemstones (2009)
Chemical formula of Black Opal- SiO 2 + H 2OUlrich Henn and Claudio C.

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Hematite and Black Opal Specific Gravity

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