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Pyrope
Pyrope

Cordierite
Cordierite



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Pyrope
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Cordierite

Pyrope and Cordierite Physical Properties

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Physical Properties

Tenacity

-
Brittle

Solubility

insoluble in water
-

Durability

-
-

Specific Gravity

3.62-3.872.57-2.66
1 7.18
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Fracture

Conchoidal
Subconchoidal, Conchoidal

Cleavage

None
Fair on {100}, poor on {001} and {010}

Mohs Hardness

7-7.57-7.5
2 10
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Chemical Composition

Mg 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
Mg2Al4Si5O18

Pyrope and Cordierite Chemical Formula

While comparing Pyrope 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 Pyrope and Cordierite chemical formula.

  • Chemical formula of Pyrope- Mg 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
  • Chemical formula of Cordierite- Mg2Al4Si5O18

Pyrope and Cordierite Specific Gravity

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