Pargasite and Cordierite Physical Properties

Pargasite

Cordierite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.04-3.262.57-2.66

1 7.18

1.5 Fracture

Splintery, Brittle, Uneven

Subconchoidal, Conchoidal, Brittle

1.6 Cleavage

{110} perfect

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

1.7 Mohs Hardness

5-67-7.5

2 10

1.8 Chemical Composition

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

Mg2Al4Si5O18

Pargasite and Cordierite Chemical Formula

While comparing Pargasite 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 Pargasite and Cordierite chemical formula.

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

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Pargasite and Cordierite Specific Gravity

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