Almandine and Annabergite Physical Properties

Almandine

Annabergite

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1 Physical Properties

1.1 Tenacity

Not Available

Sectile

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.95-4.30

3.07

1.5 Fracture

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

Brittle, Metallic, Brittle, Metallic, Brittle, Metallic

1.6 Cleavage

none

Perfect on {010}, indistinct on {100} and {102}

1.7 Mohs Hardness

7-7.5

1.8 Chemical Composition

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

Ni3(AsO4)2•8(H2O)

Almandine and Annabergite Chemical Formula

While comparing Almandine and Annabergite 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 Annabergite chemical formula.

Chemical formula of Almandine- Fe 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
Chemical formula of Annabergite- Ni3(AsO4)2•8(H2O)

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Almandine and Annabergite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Almandine and Annabergite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Almandine and Annabergite Optical Properties during the identification of gemstone. Specific gravity of Almandine is 3.07 whereas that of Annabergite is 3.07.