Astrophyllite and Cordierite Physical Properties

Astrophyllite

Cordierite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.2-3.42.57-2.66

1 7.18

1.5 Fracture

Uneven, Brittle, Metallic

Subconchoidal, Conchoidal, Brittle

1.6 Cleavage

Perfect on [001] imperfect on [100]

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

1.7 Mohs Hardness

37-7.5

2 10

1.8 Chemical Composition

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

Mg2Al4Si5O18

Astrophyllite and Cordierite Chemical Formula

While comparing Astrophyllite and Cordierite 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 Astrophyllite and Cordierite chemical formula.

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

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Astrophyllite and Cordierite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Astrophyllite and Cordierite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Astrophyllite and Cordierite Optical Properties during the identification of gemstone. Specific gravity of Astrophyllite is 2.57-2.66 whereas that of Cordierite is 2.57-2.66.