Erythrite and Sillimanite Physical Properties

Erythrite

Sillimanite

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1 Physical Properties

1.1 Tenacity

Sectile

Tough

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.063.20-3.26

1 7.18

1.5 Fracture

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

Splintery

1.6 Cleavage

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

{010} perfect

1.7 Mohs Hardness

Not Available6-7.5

2 10

1.8 Chemical Composition

Co3(AsO4)2•8(H2O)

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

Erythrite and Sillimanite Chemical Formula

While comparing Erythrite and Sillimanite 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 Sillimanite chemical formula.

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

Compare Red Gemstones

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Erythrite and Sillimanite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Erythrite and Sillimanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Erythrite and Sillimanite Optical Properties during the identification of gemstone. Specific gravity of Erythrite is 3.20-3.26 whereas that of Sillimanite is 3.20-3.26.