Hematite and Onyx Physical Properties

Hematite

Onyx

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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

5.00-5.302.55-2.70

1 7.18

1.5 Fracture

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

Not Available

1.6 Cleavage

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

Indiscernible

1.7 Mohs Hardness

66.5-7

2 10

1.8 Chemical Composition

Fe 2O 3Arthur Thomas , Gemstones (2009)

SiO₂

Hematite and Onyx Chemical Formula

While comparing Hematite and Onyx 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 Onyx chemical formula.

Chemical formula of Hematite- Fe 2O 3Arthur Thomas , Gemstones (2009)
Chemical formula of Onyx- SiO₂

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Hematite and Onyx Specific Gravity

Another important criteria for qualitative analysis of gemstones is Hematite and Onyx Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Hematite and Onyx Optical Properties during the identification of gemstone. Specific gravity of Hematite is 2.55-2.70 whereas that of Onyx is 2.55-2.70.