Cordierite and Oligoclase Physical Properties

Cordierite

Oligoclase

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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

2.57-2.662.62-2.67

1 7.18

1.5 Fracture

Subconchoidal, Conchoidal, Brittle

Gems, Sixth Edition (2006), Gems, Sixth Edition (2006), Uneven

1.6 Cleavage

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

From the Greek, oligos and kasein, little cleavage.

1.7 Mohs Hardness

7-7.56-6.5

2 10

1.8 Chemical Composition

Mg2Al4Si5O18

Na(90-70%)Ca(10-30%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)

Cordierite and Oligoclase Chemical Formula

While comparing Cordierite and Oligoclase 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 Oligoclase chemical formula.

Chemical formula of Cordierite- Mg2Al4Si5O18
Chemical formula of Oligoclase- Na(90-70%)Ca(10-30%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)

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Cordierite and Oligoclase Specific Gravity

Another important criteria for qualitative analysis of gemstones is Cordierite and Oligoclase Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Cordierite and Oligoclase Optical Properties during the identification of gemstone. Specific gravity of Cordierite is 2.62-2.67 whereas that of Oligoclase is 2.62-2.67.