Phlogopite and Cordierite Physical Properties

Phlogopite

Cordierite

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1 Physical Properties

1.1 Tenacity

Tough

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.78-2.852.57-2.66

1 7.18

1.5 Fracture

None, Uneven

Subconchoidal, Conchoidal, Brittle

1.6 Cleavage

Perfect basal (001)

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

1.7 Mohs Hardness

2-2.57-7.5

2 10

1.8 Chemical Composition

Not Available

Mg2Al4Si5O18

Phlogopite and Cordierite Chemical Formula

While comparing Phlogopite and Cordierite 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 Phlogopite and Cordierite chemical formula.

Chemical formula of Cordierite- Mg2Al4Si5O18

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Phlogopite and Cordierite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Phlogopite and Cordierite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Phlogopite and Cordierite Optical Properties during the identification of gemstone. Specific gravity of Phlogopite is 2.57-2.66 whereas that of Cordierite is 2.57-2.66.