Hematite and Gahnite Physical Properties

Hematite

Gahnite

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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

5.00-5.304.00-4.62

1 7.18

1.5 Fracture

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

Conchoidal, Uneven

1.6 Cleavage

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

Indistinct parting on [111]

1.7 Mohs Hardness

67.5-8

2 10

1.8 Chemical Composition

Fe 2O 3Arthur Thomas , Gemstones (2009)

ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)

Hematite and Gahnite Chemical Formula

While comparing Hematite and Gahnite 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 Gahnite chemical formula.

Chemical formula of Hematite- Fe 2O 3Arthur Thomas , Gemstones (2009)
Chemical formula of Gahnite- ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)

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Hematite and Gahnite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Hematite and Gahnite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Hematite and Gahnite Optical Properties during the identification of gemstone. Specific gravity of Hematite is 4.00-4.62 whereas that of Gahnite is 4.00-4.62.