Sapphire and Astrophyllite Physical Properties

Sapphire

Astrophyllite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

insoluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.95-4.033.2-3.4

1 7.18

1.5 Fracture

Uneven, Uneven, Gems, Sixth Edition (2006)

Uneven, Brittle, Metallic

1.6 Cleavage

None, but may exhibit parting

Perfect on [001] imperfect on [100]

1.7 Mohs Hardness

2 10

1.8 Chemical Composition

Al ₂ O ₃

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

Sapphire and Astrophyllite Chemical Formula

While comparing Sapphire 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 Sapphire and Astrophyllite chemical formula.

Chemical formula of Sapphire- Al ₂ O ₃
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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Sapphire and Astrophyllite Specific Gravity

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