Cordierite and Ruby Physical Properties

Cordierite

Ruby

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1 Physical Properties

1.1 Tenacity

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.57-2.663.97-4.05

1 7.18

1.5 Fracture

Subconchoidal, Conchoidal, Brittle

Conchoidal

1.6 Cleavage

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

No true cleavage

1.7 Mohs Hardness

7-7.59

2 10

1.8 Chemical Composition

Mg2Al4Si5O18

Al ₂ O ₃

Cordierite and Ruby Chemical Formula

While comparing Cordierite and Ruby 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 Ruby chemical formula.

Chemical formula of Cordierite- Mg2Al4Si5O18
Chemical formula of Ruby- Al ₂ O ₃

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Cordierite and Ruby Specific Gravity

Another important criteria for qualitative analysis of gemstones is Cordierite and Ruby Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Cordierite and Ruby Optical Properties during the identification of gemstone. Specific gravity of Cordierite is 3.97-4.05 whereas that of Ruby is 3.97-4.05.