Kyanite and Astrophyllite Physical Properties

Kyanite

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

3.53-3.653.2-3.4

1 7.18

1.5 Fracture

Splintery, Brittle, Metallic

Uneven, Brittle, Metallic

1.6 Cleavage

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

Perfect on [001] imperfect on [100]

1.7 Mohs Hardness

4-73

2 10

1.8 Chemical Composition

Not Available

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

Kyanite and Astrophyllite Chemical Formula

While comparing Kyanite 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 Kyanite and Astrophyllite 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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Kyanite and Astrophyllite Specific Gravity

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