Cordierite and Bustamite Physical Properties

Cordierite

Bustamite

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Physical Properties

Tenacity

Brittle

Solubility

Partly soluble in HCl.

Durability

Specific Gravity

2.57-2.663.32-3.43

1 7.18

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Fracture

Subconchoidal, Conchoidal

Conchoidal

Cleavage

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

{100} perfect; {110} and {1 1 0} good; {010} poor

Mohs Hardness

7-7.55.5-6

2 10

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Chemical Composition

Mg2Al4Si5O18

(Ca,Mn2+ )Si 3O 9Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Cordierite and Bustamite Chemical Formula

While comparing Cordierite and Bustamite 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 Bustamite chemical formula.

Chemical formula of Cordierite- Mg2Al4Si5O18
Chemical formula of Bustamite- (Ca,Mn2+ )Si 3O 9Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Compare Blue Gemstones

Cordierite Vs Plumbogummite

Cordierite Vs Riebeckite

Cordierite Vs Rosasite

Cordierite and Bustamite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Cordierite and Bustamite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Cordierite and Bustamite Optical Properties during the identification of gemstone. Specific gravity of Cordierite is 3.32-3.43 whereas that of Bustamite is 3.32-3.43.