Astrophyllite and Zinnwaldite Physical Properties

Astrophyllite

Zinnwaldite

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1 Physical Properties

1.1 Tenacity

Not Available

Elastic

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.2-3.4

2.9-3.1

1.5 Fracture

Uneven, Brittle, Metallic

Uneven

1.6 Cleavage

Perfect on [001] imperfect on [100]

Perfect basal {001}

1.7 Mohs Hardness

3.5-4.0

1.8 Chemical Composition

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

Not Available

Astrophyllite and Zinnwaldite Chemical Formula

While comparing Astrophyllite and Zinnwaldite 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 Zinnwaldite chemical formula.

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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Astrophyllite and Zinnwaldite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Astrophyllite and Zinnwaldite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Astrophyllite and Zinnwaldite Optical Properties during the identification of gemstone. Specific gravity of Astrophyllite is 2.9-3.1 whereas that of Zinnwaldite is 2.9-3.1.