Andalusite and Erythrite Physical Properties

Andalusite

Erythrite

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1 Physical Properties

1.1 Tenacity

Not Available

Sectile

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.05-3.21

3.06

1.5 Fracture

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

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

1.6 Cleavage

Good on {110}, poor on {100}

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

1.7 Mohs Hardness

7.5

Not Available

1.8 Chemical Composition

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

Co3(AsO4)2•8(H2O)

Andalusite and Erythrite Chemical Formula

While comparing Andalusite 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 Andalusite and Erythrite chemical formula.

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

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Andalusite and Erythrite Specific Gravity

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