Astrophyllite and Bertrandite Physical Properties

Astrophyllite

Bertrandite

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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

3.2-3.42.59-2.60

1 7.18

1.5 Fracture

Uneven, Brittle, Metallic

Brittle, Metallic, Brittle, Metallic

1.6 Cleavage

Perfect on [001] imperfect on [100]

{001} Perfect, {110} Distinct, {101} Distinct

1.7 Mohs Hardness

36-7

2 10

1.8 Chemical Composition

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

Be 4Si 2O 7(OH) 2Anthony et al , Handbook of mineralogy (2001)

Astrophyllite and Bertrandite Chemical Formula

While comparing Astrophyllite and Bertrandite 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 Bertrandite 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 Bertrandite- Be 4Si 2O 7(OH) 2Anthony et al , Handbook of mineralogy (2001)

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Astrophyllite and Bertrandite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Astrophyllite and Bertrandite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Astrophyllite and Bertrandite Optical Properties during the identification of gemstone. Specific gravity of Astrophyllite is 2.59-2.60 whereas that of Bertrandite is 2.59-2.60.