Cordierite and Anhydrite Physical Properties

Cordierite

Anhydrite

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Physical Properties

Tenacity

Brittle

Solubility

Durability

Specific Gravity

2.57-2.662.90-2.98

1 7.18

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Fracture

Subconchoidal, Conchoidal

Conchoidal

Cleavage

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

Rare tabular and prismatic crystals. Usually occurs as fibrous, parallel veins that break off into cleavage fragments.

Mohs Hardness

7-7.53.5

2 10

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Chemical Composition

Mg2Al4Si5O18

CaSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

Cordierite and Anhydrite Chemical Formula

While comparing Cordierite and Anhydrite 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 Anhydrite chemical formula.

Chemical formula of Cordierite- Mg2Al4Si5O18
Chemical formula of Anhydrite- CaSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

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Cordierite Vs Rosasite

Cordierite and Anhydrite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Cordierite and Anhydrite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Cordierite and Anhydrite Optical Properties during the identification of gemstone. Specific gravity of Cordierite is 2.90-2.98 whereas that of Anhydrite is 2.90-2.98.