Almandine and Erythrite Physical Properties

Almandine

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

3.95-4.30

3.06

1.5 Fracture

Conchoidal, Brittle, Conchoidal, Brittle, Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal

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

1.6 Cleavage

none

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

1.7 Mohs Hardness

7-7.5

Not Available

1.8 Chemical Composition

Fe 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)

Co3(AsO4)2•8(H2O)

Almandine and Erythrite Chemical Formula

While comparing Almandine 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 Almandine and Erythrite chemical formula.

Chemical formula of Almandine- Fe 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
Chemical formula of Erythrite- Co3(AsO4)2•8(H2O)

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Almandine and Erythrite Specific Gravity

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