Erythrite and Andalusite Physical Properties

Erythrite

Andalusite

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1 Physical Properties

1.1 Tenacity

Sectile

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.06

3.05-3.21

1.5 Fracture

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

Uneven, Subconchoidal, Uneven, Subconchoidal, Splintery, UnevenArthur Thomas, Gemstones (2009)

1.6 Cleavage

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

Good on {110}, poor on {100}

1.7 Mohs Hardness

Not Available

7.5

1.8 Chemical Composition

Co3(AsO4)2•8(H2O)

Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

Erythrite and Andalusite Chemical Formula

While comparing Erythrite and Andalusite 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 Andalusite chemical formula.

Chemical formula of Erythrite- Co3(AsO4)2•8(H2O)
Chemical formula of Andalusite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

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Erythrite and Andalusite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Erythrite and Andalusite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Erythrite and Andalusite Optical Properties during the identification of gemstone. Specific gravity of Erythrite is 3.05-3.21 whereas that of Andalusite is 3.05-3.21.