Kyanite and Erythrite Physical Properties

Kyanite

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

3.53-3.653.06

1 7.18

1.5 Fracture

Splintery, Brittle, Metallic

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

1.6 Cleavage

[100] perfect [010] imperfect with 79° angle between

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

1.7 Mohs Hardness

4-7Not Available

2 10

1.8 Chemical Composition

Not Available

Co3(AsO4)2•8(H2O)

Kyanite and Erythrite Chemical Formula

While comparing Kyanite 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 Kyanite and Erythrite chemical formula.

Chemical formula of Erythrite- Co3(AsO4)2•8(H2O)

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Kyanite and Erythrite Specific Gravity

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