Fayalite and Astrophyllite Physical Properties

Fayalite

Astrophyllite

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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

4.3923.2-3.4

1 7.18

1.5 Fracture

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

Uneven, Brittle, Metallic

1.6 Cleavage

{010} moderate, {100} imperfect

Perfect on [001] imperfect on [100]

1.7 Mohs Hardness

6.5-73

2 10

1.8 Chemical Composition

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

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

Fayalite and Astrophyllite Chemical Formula

While comparing Fayalite 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 Fayalite and Astrophyllite chemical formula.

Chemical formula of Fayalite- Fe 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006)
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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Fayalite and Astrophyllite Specific Gravity

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