Annabergite and Astrophyllite Physical Properties

Annabergite

Astrophyllite

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1 Physical Properties

1.1 Tenacity

Sectile

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.073.2-3.4

1 7.18

1.5 Fracture

Brittle, Metallic, Brittle, Metallic, Brittle, Metallic

Uneven, Brittle, Metallic

1.6 Cleavage

Perfect on {010}, indistinct on {100} and {102}

Perfect on [001] imperfect on [100]

1.7 Mohs Hardness

2 10

1.8 Chemical Composition

Ni3(AsO4)2•8(H2O)

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

Annabergite and Astrophyllite Chemical Formula

While comparing Annabergite 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 Annabergite and Astrophyllite chemical formula.

Chemical formula of Annabergite- Ni3(AsO4)2•8(H2O)
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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Annabergite and Astrophyllite Specific Gravity

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