Sillimanite and Erythrite Physical Properties

Sillimanite

Erythrite

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1 Physical Properties

1.1 Tenacity

Tough

Sectile

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.20-3.263.06

1 7.18

1.5 Fracture

Splintery

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

1.6 Cleavage

{010} perfect

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

1.7 Mohs Hardness

6-7.5Not Available

2 10

1.8 Chemical Composition

Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)

Co3(AsO4)2•8(H2O)

Sillimanite and Erythrite Chemical Formula

While comparing Sillimanite 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 Sillimanite and Erythrite chemical formula.

Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Erythrite- Co3(AsO4)2•8(H2O)

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Sillimanite and Erythrite Specific Gravity

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