Cordierite and Phlogopite Physical Properties

Cordierite

Phlogopite

Add ⊕

1 Physical Properties

1.1 Tenacity

Brittle

Tough

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.57-2.66

2.78-2.85

1.5 Fracture

Subconchoidal, Conchoidal, Brittle

None, Uneven

1.6 Cleavage

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

Perfect basal (001)

1.7 Mohs Hardness

7-7.5

2-2.5

1.8 Chemical Composition

Mg2Al4Si5O18

Not Available

Cordierite and Phlogopite Chemical Formula

While comparing Cordierite and Phlogopite 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 Phlogopite chemical formula.

Chemical formula of Cordierite- Mg2Al4Si5O18

Compare Blue Gemstones

Cordierite Vs Rosasite

Cordierite Vs Plumbogummite

Cordierite Vs Riebeckite

Cordierite and Phlogopite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Cordierite and Phlogopite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Cordierite and Phlogopite Optical Properties during the identification of gemstone. Specific gravity of Cordierite is 2.78-2.85 whereas that of Phlogopite is 2.78-2.85.