Erythrite and Gahnite Physical Properties

Erythrite

Gahnite

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1 Physical Properties

1.1 Tenacity

Sectile

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.064.00-4.62

1 7.18

1.5 Fracture

Sectile Curved shavings or scrapings produced by a knife blade, (e.g. graphite).

Conchoidal, Uneven

1.6 Cleavage

Perfect on {010}; poor on {100} and { 1 02}.

Indistinct parting on [111]

1.7 Mohs Hardness

Not Available7.5-8

2 10

1.8 Chemical Composition

Co3(AsO4)2•8(H2O)

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

Erythrite and Gahnite Chemical Formula

While comparing Erythrite 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 Erythrite and Gahnite chemical formula.

Chemical formula of Erythrite- Co3(AsO4)2•8(H2O)
Chemical formula of Gahnite- ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)

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Erythrite and Gahnite Specific Gravity

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