Afghanite and Cordierite Physical Properties

Afghanite

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

2.55-2.65

2.57-2.66

1.5 Fracture

Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle, Conchoidal, Brittle

Subconchoidal, Conchoidal, Brittle

1.6 Cleavage

Perfect {10 1 0}

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

1.7 Mohs Hardness

5.5-6

7-7.5

1.8 Chemical Composition

(Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)

Mg2Al4Si5O18

Afghanite and Cordierite Chemical Formula

While comparing Afghanite 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 Afghanite and Cordierite chemical formula.

Chemical formula of Afghanite- (Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)
Chemical formula of Cordierite- Mg2Al4Si5O18

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Afghanite and Cordierite Specific Gravity

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