Anorthite and Erythrite Physical Properties

Anorthite

Erythrite

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1 Physical Properties

1.1 Tenacity

Brittle

Sectile

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.773.06

1 7.18

1.5 Fracture

Uneven, Uneven, Gems, Sixth Edition (2006)

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

1.6 Cleavage

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

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

1.7 Mohs Hardness

6-6.5Not Available

2 10

1.8 Chemical Composition

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

Co3(AsO4)2•8(H2O)

Anorthite and Erythrite Chemical Formula

While comparing Anorthite 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 Anorthite and Erythrite chemical formula.

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

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Anorthite and Erythrite Specific Gravity

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