Astrophyllite and Anorthite Physical Properties

Astrophyllite

Anorthite

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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

3.2-3.42.77

1 7.18

1.5 Fracture

Uneven, Brittle, Metallic

Uneven, Uneven, Gems, Sixth Edition (2006)

1.6 Cleavage

Perfect on [001] imperfect on [100]

Perfect [001] good [010] poor [110]

1.7 Mohs Hardness

36-6.5

2 10

1.8 Chemical Composition

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

CaAl 2Si 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)

Astrophyllite and Anorthite Chemical Formula

While comparing Astrophyllite and Anorthite 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 Anorthite 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 Anorthite- CaAl 2Si 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)

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Astrophyllite and Anorthite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Astrophyllite and Anorthite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Astrophyllite and Anorthite Optical Properties during the identification of gemstone. Specific gravity of Astrophyllite is 2.77 whereas that of Anorthite is 2.77.