Astrophyllite and Fayalite Physical Properties

Astrophyllite

Fayalite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.2-3.44.392

1 7.18

1.5 Fracture

Uneven, Brittle, Metallic

Conchoidal, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle

1.6 Cleavage

Perfect on [001] imperfect on [100]

{010} moderate, {100} imperfect

1.7 Mohs Hardness

36.5-7

2 10

1.8 Chemical Composition

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

Fe 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006)

Astrophyllite and Fayalite Chemical Formula

While comparing Astrophyllite and Fayalite 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 Fayalite 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 Fayalite- Fe 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006)

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Astrophyllite and Fayalite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Astrophyllite and Fayalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Astrophyllite and Fayalite Optical Properties during the identification of gemstone. Specific gravity of Astrophyllite is 4.392 whereas that of Fayalite is 4.392.