Cordierite and Astrophyllite Physical Properties

Cordierite

Astrophyllite

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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

2.57-2.663.2-3.4

1 7.18

1.5 Fracture

Subconchoidal, Conchoidal, Brittle

Uneven, Brittle, Metallic

1.6 Cleavage

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

Perfect on [001] imperfect on [100]

1.7 Mohs Hardness

7-7.53

2 10

1.8 Chemical Composition

Mg2Al4Si5O18

(K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)

Cordierite and Astrophyllite Chemical Formula

While comparing Cordierite and Astrophyllite 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 Astrophyllite chemical formula.

Chemical formula of Cordierite- Mg2Al4Si5O18
Chemical formula of Astrophyllite- (K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)

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Cordierite and Astrophyllite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Cordierite and Astrophyllite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Cordierite and Astrophyllite Optical Properties during the identification of gemstone. Specific gravity of Cordierite is 3.2-3.4 whereas that of Astrophyllite is 3.2-3.4.