Cordierite and Annabergite Physical Properties

Cordierite

Annabergite

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1 Physical Properties

1.1 Tenacity

Brittle

Sectile

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.57-2.66

3.07

1.5 Fracture

Subconchoidal, Conchoidal, Brittle

Brittle, Metallic, Brittle, Metallic, Brittle, Metallic

1.6 Cleavage

Fair on {100}, poor on {001} and {010}

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

1.7 Mohs Hardness

7-7.5

1.8 Chemical Composition

Mg2Al4Si5O18

Ni3(AsO4)2•8(H2O)

Cordierite and Annabergite Chemical Formula

While comparing Cordierite 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 Cordierite and Annabergite chemical formula.

Chemical formula of Cordierite- Mg2Al4Si5O18
Chemical formula of Annabergite- Ni3(AsO4)2•8(H2O)

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Cordierite and Annabergite Specific Gravity

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