Gahnite and Erythrite Physical Properties

Gahnite

Erythrite

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1 Physical Properties

1.1 Tenacity

Not Available

Sectile

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

4.00-4.623.06

1 7.18

1.5 Fracture

Conchoidal, Uneven

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

1.6 Cleavage

Indistinct parting on [111]

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

1.7 Mohs Hardness

7.5-8Not Available

2 10

1.8 Chemical Composition

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

Co3(AsO4)2•8(H2O)

Gahnite and Erythrite Chemical Formula

While comparing Gahnite and Erythrite 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 Gahnite and Erythrite chemical formula.

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

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Gahnite and Erythrite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Gahnite and Erythrite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Gahnite and Erythrite Optical Properties during the identification of gemstone. Specific gravity of Gahnite is 3.06 whereas that of Erythrite is 3.06.