Astrophyllite and Kyanite Physical Properties

Astrophyllite

Kyanite

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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

3.2-3.4

3.53-3.65

1.5 Fracture

Uneven, Brittle, Metallic

Splintery, Brittle, Metallic

1.6 Cleavage

Perfect on [001] imperfect on [100]

[100] perfect [010] imperfect with 79° angle between

1.7 Mohs Hardness

4-7

1.8 Chemical Composition

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

Not Available

Astrophyllite and Kyanite Chemical Formula

While comparing Astrophyllite and Kyanite 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 Kyanite chemical formula.

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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Astrophyllite and Kyanite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Astrophyllite and Kyanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Astrophyllite and Kyanite Optical Properties during the identification of gemstone. Specific gravity of Astrophyllite is 3.53-3.65 whereas that of Kyanite is 3.53-3.65.