Annabergite and Almandine Physical Properties

Annabergite

Almandine

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1 Physical Properties

1.1 Tenacity

Sectile

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.07

3.95-4.30

1.5 Fracture

Brittle, Metallic, Brittle, Metallic, Brittle, Metallic

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

1.6 Cleavage

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

none

1.7 Mohs Hardness

7-7.5

1.8 Chemical Composition

Ni3(AsO4)2•8(H2O)

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

Annabergite and Almandine Chemical Formula

While comparing Annabergite and Almandine 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 Annabergite and Almandine chemical formula.

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

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Annabergite and Almandine Specific Gravity

Another important criteria for qualitative analysis of gemstones is Annabergite and Almandine Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Annabergite and Almandine Optical Properties during the identification of gemstone. Specific gravity of Annabergite is 3.95-4.30 whereas that of Almandine is 3.95-4.30.