Astrophyllite and Sapphire Physical Properties

Astrophyllite

Sapphire

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

insoluble

1.3 Durability

Not Available

1.4 Specific Gravity

3.2-3.4

3.95-4.03

1.5 Fracture

Uneven, Brittle, Metallic

Uneven, Uneven, Gems, Sixth Edition (2006)

1.6 Cleavage

Perfect on [001] imperfect on [100]

None, but may exhibit parting

1.7 Mohs Hardness

1.8 Chemical Composition

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

Al ₂ O ₃

Astrophyllite and Sapphire Chemical Formula

While comparing Astrophyllite and Sapphire 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 Sapphire 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 Sapphire- Al ₂ O ₃

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Astrophyllite and Sapphire Specific Gravity

Another important criteria for qualitative analysis of gemstones is Astrophyllite and Sapphire Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Astrophyllite and Sapphire Optical Properties during the identification of gemstone. Specific gravity of Astrophyllite is 3.95-4.03 whereas that of Sapphire is 3.95-4.03.