Astrophyllite and Sillimanite Physical Properties

Astrophyllite

Sillimanite

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1 Physical Properties

1.1 Tenacity

Not Available

Tough

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.2-3.4

3.20-3.26

1.5 Fracture

Uneven, Brittle, Metallic

Splintery

1.6 Cleavage

Perfect on [001] imperfect on [100]

{010} perfect

1.7 Mohs Hardness

6-7.5

1.8 Chemical Composition

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

Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)

Astrophyllite and Sillimanite Chemical Formula

While comparing Astrophyllite and Sillimanite 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 Sillimanite 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 Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)

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Astrophyllite and Sillimanite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Astrophyllite and Sillimanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Astrophyllite and Sillimanite Optical Properties during the identification of gemstone. Specific gravity of Astrophyllite is 3.20-3.26 whereas that of Sillimanite is 3.20-3.26.