Biotite and Astrophyllite Physical Properties

Biotite

Astrophyllite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.7-3.33.2-3.4

1 7.18

1.5 Fracture

Uneven, Even, Yellow, White

Uneven, Brittle, Metallic

1.6 Cleavage

Perfect on the {001}

Perfect on [001] imperfect on [100]

1.7 Mohs Hardness

2.5-3.03

2 10

1.8 Chemical Composition

K(Mg,Fe++)3[AlSi3O10(OH,F)2

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

Biotite and Astrophyllite Chemical Formula

While comparing Biotite 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 Biotite and Astrophyllite chemical formula.

Chemical formula of Biotite- K(Mg,Fe++)3[AlSi3O10(OH,F)2
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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Biotite and Astrophyllite Specific Gravity

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