Almandine and Cordierite Physical Properties

Almandine

Cordierite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.95-4.30

2.57-2.66

1.5 Fracture

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

Subconchoidal, Conchoidal, Brittle

1.6 Cleavage

none

Fair on {100}, poor on {001} and {010}

1.7 Mohs Hardness

7-7.5

1.8 Chemical Composition

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

Mg2Al4Si5O18

Almandine and Cordierite Chemical Formula

While comparing Almandine and Cordierite 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 Cordierite chemical formula.

Chemical formula of Almandine- Fe 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
Chemical formula of Cordierite- Mg2Al4Si5O18

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Almandine and Cordierite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Almandine and Cordierite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Almandine and Cordierite Optical Properties during the identification of gemstone. Specific gravity of Almandine is 2.57-2.66 whereas that of Cordierite is 2.57-2.66.