Almandine and Sellaite Physical Properties

Almandine

Sellaite

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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

3.95-4.303.14-3.16

1 7.18

1.5 Fracture

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

Conchoidal, ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle

1.6 Cleavage

none

Perfect on {010} and {110}

1.7 Mohs Hardness

7-7.55-5.5

2 10

1.8 Chemical Composition

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

MgF 2Ulrich Henn and Claudio C.

Almandine and Sellaite Chemical Formula

While comparing Almandine and Sellaite 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 Sellaite chemical formula.

Chemical formula of Almandine- Fe 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
Chemical formula of Sellaite- MgF 2Ulrich Henn and Claudio C.

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Almandine and Sellaite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Almandine and Sellaite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Almandine and Sellaite Optical Properties during the identification of gemstone. Specific gravity of Almandine is 3.14-3.16 whereas that of Sellaite is 3.14-3.16.