Astrophyllite and Pyrophyllite Physical Properties

Astrophyllite

Pyrophyllite

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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

3.2-3.42.65-2.90

1 7.18

1.5 Fracture

Uneven, Brittle, Metallic

Gemstones (2009), Flexible Flexible fragments.

1.6 Cleavage

Perfect on [001] imperfect on [100]

{001} Perfect

1.7 Mohs Hardness

3Not Available

2 10

1.8 Chemical Composition

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

Al 2Si 4O 10(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Astrophyllite and Pyrophyllite Chemical Formula

While comparing Astrophyllite and Pyrophyllite 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 Pyrophyllite 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 Pyrophyllite- Al 2Si 4O 10(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Astrophyllite and Pyrophyllite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Astrophyllite and Pyrophyllite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Astrophyllite and Pyrophyllite Optical Properties during the identification of gemstone. Specific gravity of Astrophyllite is 2.65-2.90 whereas that of Pyrophyllite is 2.65-2.90.