Erythrite and Almandine Physical Properties

Erythrite

Almandine

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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

3.95-4.30

1.5 Fracture

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

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

1.6 Cleavage

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

none

1.7 Mohs Hardness

Not Available

7-7.5

1.8 Chemical Composition

Co3(AsO4)2•8(H2O)

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

Erythrite and Almandine Chemical Formula

While comparing Erythrite and Almandine 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 Almandine chemical formula.

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

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Erythrite and Almandine Specific Gravity

Another important criteria for qualitative analysis of gemstones is Erythrite and Almandine Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Erythrite and Almandine Optical Properties during the identification of gemstone. Specific gravity of Erythrite is 3.95-4.30 whereas that of Almandine is 3.95-4.30.