Almandine and Sapphire Physical Properties

Almandine

Sapphire

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

insoluble

1.3 Durability

Not Available

1.4 Specific Gravity

3.95-4.30

3.95-4.03

1.5 Fracture

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

Uneven, Uneven, Gems, Sixth Edition (2006)

1.6 Cleavage

none

None, but may exhibit parting

1.7 Mohs Hardness

7-7.5

1.8 Chemical Composition

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

Al ₂ O ₃

Almandine and Sapphire Chemical Formula

While comparing Almandine and Sapphire 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 Sapphire chemical formula.

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

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Almandine and Sapphire Specific Gravity

Another important criteria for qualitative analysis of gemstones is Almandine and Sapphire Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Almandine and Sapphire Optical Properties during the identification of gemstone. Specific gravity of Almandine is 3.95-4.03 whereas that of Sapphire is 3.95-4.03.