Cordierite and Realgar Physical Properties

Cordierite

Realgar

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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

2.57-2.663.56

1 7.18

1.5 Fracture

Subconchoidal, Conchoidal, Brittle

(e.g. graphite).

1.6 Cleavage

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

{010} Good

1.7 Mohs Hardness

7-7.5Not Available

2 10

1.8 Chemical Composition

Mg2Al4Si5O18

AsSMichael OâDonoghue , Gems, Sixth Edition (2006)

Cordierite and Realgar Chemical Formula

While comparing Cordierite and Realgar 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 Realgar chemical formula.

Chemical formula of Cordierite- Mg2Al4Si5O18
Chemical formula of Realgar- AsSMichael OâDonoghue , Gems, Sixth Edition (2006)

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Cordierite and Realgar Specific Gravity

Another important criteria for qualitative analysis of gemstones is Cordierite and Realgar Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Cordierite and Realgar Optical Properties during the identification of gemstone. Specific gravity of Cordierite is 3.56 whereas that of Realgar is 3.56.