Almandine and Anorthite Physical Properties

Almandine

Anorthite

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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

3.95-4.302.77

1 7.18

1.5 Fracture

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

Uneven, Uneven, Gems, Sixth Edition (2006)

1.6 Cleavage

none

Perfect [001] good [010] poor [110]

1.7 Mohs Hardness

7-7.56-6.5

2 10

1.8 Chemical Composition

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

CaAl 2Si 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)

Almandine and Anorthite Chemical Formula

While comparing Almandine and Anorthite 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 Anorthite chemical formula.

Chemical formula of Almandine- Fe 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
Chemical formula of Anorthite- CaAl 2Si 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)

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Almandine and Anorthite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Almandine and Anorthite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Almandine and Anorthite Optical Properties during the identification of gemstone. Specific gravity of Almandine is 2.77 whereas that of Anorthite is 2.77.