Cordierite and Pargasite Physical Properties

Cordierite

Pargasite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.57-2.663.04-3.26

1 7.18

1.5 Fracture

Subconchoidal, Conchoidal, Brittle

Splintery, Brittle, Uneven

1.6 Cleavage

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

{110} perfect

1.7 Mohs Hardness

7-7.55-6

2 10

1.8 Chemical Composition

Mg2Al4Si5O18

NaCa 2(Mg 4Al)Si 6Al 2O 22(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)

Cordierite and Pargasite Chemical Formula

While comparing Cordierite and Pargasite 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 Pargasite chemical formula.

Chemical formula of Cordierite- Mg2Al4Si5O18
Chemical formula of Pargasite- NaCa 2(Mg 4Al)Si 6Al 2O 22(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)

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Cordierite and Pargasite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Cordierite and Pargasite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Cordierite and Pargasite Optical Properties during the identification of gemstone. Specific gravity of Cordierite is 3.04-3.26 whereas that of Pargasite is 3.04-3.26.