Astrophyllite and Poldervaartite Physical Properties

Astrophyllite

Poldervaartite

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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

3.2-3.42.91

1 7.18

1.5 Fracture

Uneven, Brittle, Metallic

Handbook of mineralogy (2001)

1.6 Cleavage

Perfect on [001] imperfect on [100]

None

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)

(Ca,Mn2+ ) 2(SiO 3OH)(OH)Anthony et al , Handbook of Mineralogy (2001)

Astrophyllite and Poldervaartite Chemical Formula

While comparing Astrophyllite and Poldervaartite 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 Poldervaartite 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 Poldervaartite- (Ca,Mn2+ ) 2(SiO 3OH)(OH)Anthony et al , Handbook of Mineralogy (2001)

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Astrophyllite and Poldervaartite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Astrophyllite and Poldervaartite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Astrophyllite and Poldervaartite Optical Properties during the identification of gemstone. Specific gravity of Astrophyllite is 2.91 whereas that of Poldervaartite is 2.91.