Erythrite and Anorthite Physical Properties

Erythrite

Anorthite

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1 Physical Properties

1.1 Tenacity

Sectile

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.06

2.77

1.5 Fracture

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

Uneven, Uneven, Gems, Sixth Edition (2006)

1.6 Cleavage

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

Perfect [001] good [010] poor [110]

1.7 Mohs Hardness

Not Available

6-6.5

1.8 Chemical Composition

Co3(AsO4)2•8(H2O)

CaAl 2Si 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)

Erythrite and Anorthite Chemical Formula

While comparing Erythrite and Anorthite 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 Anorthite chemical formula.

Chemical formula of Erythrite- Co3(AsO4)2•8(H2O)
Chemical formula of Anorthite- CaAl 2Si 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)

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Erythrite and Anorthite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Erythrite and Anorthite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Erythrite and Anorthite Optical Properties during the identification of gemstone. Specific gravity of Erythrite is 2.77 whereas that of Anorthite is 2.77.