Cordierite and Brucite Physical Properties

Cordierite

Brucite

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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

2.57-2.662.39

1 7.18

1.5 Fracture

Subconchoidal, Conchoidal, Brittle

Irregular

1.6 Cleavage

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

Perfect on {0001}

1.7 Mohs Hardness

7-7.52.5

2 10

1.8 Chemical Composition

Mg2Al4Si5O18

Mg(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)

Cordierite and Brucite Chemical Formula

While comparing Cordierite and Brucite 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 Brucite chemical formula.

Chemical formula of Cordierite- Mg2Al4Si5O18
Chemical formula of Brucite- Mg(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)

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Cordierite and Brucite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Cordierite and Brucite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Cordierite and Brucite Optical Properties during the identification of gemstone. Specific gravity of Cordierite is 2.39 whereas that of Brucite is 2.39.