Almandine and Spinel Physical Properties

Almandine

Spinel

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

none

1.3 Durability

Not Available

1.4 Specific Gravity

3.95-4.30

3.64-3.66

1.5 Fracture

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

Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)

1.6 Cleavage

none

None, but may exhibit slight parting

1.7 Mohs Hardness

7-7.5

1.8 Chemical Composition

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

MgAl₂O₄

Almandine and Spinel Chemical Formula

While comparing Almandine and Spinel 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 Spinel chemical formula.

Chemical formula of Almandine- Fe 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
Chemical formula of Spinel- MgAl₂O₄

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Almandine and Spinel Specific Gravity

Another important criteria for qualitative analysis of gemstones is Almandine and Spinel Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Almandine and Spinel Optical Properties during the identification of gemstone. Specific gravity of Almandine is 3.64-3.66 whereas that of Spinel is 3.64-3.66.