Biotite and Franklinite Physical Properties

Biotite

Franklinite

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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

2.7-3.35.05-5.22

1 7.18

1.5 Fracture

Uneven, Even, Yellow, White

Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001)

1.6 Cleavage

Perfect on the {001}

None

1.7 Mohs Hardness

2.5-3.05.5-6

2 10

1.8 Chemical Composition

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

(Zn,Mn2+ ,Fe2+ )(Fe3+ ,Mn3+ ) 2O 4Anthony et al , Handbook of mineralogy (2001)

Biotite and Franklinite Chemical Formula

While comparing Biotite and Franklinite 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 Franklinite chemical formula.

Chemical formula of Biotite- K(Mg,Fe++)3[AlSi3O10(OH,F)2
Chemical formula of Franklinite- (Zn,Mn2+ ,Fe2+ )(Fe3+ ,Mn3+ ) 2O 4Anthony et al , Handbook of mineralogy (2001)

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Biotite and Franklinite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Biotite and Franklinite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Biotite and Franklinite Optical Properties during the identification of gemstone. Specific gravity of Biotite is 5.05-5.22 whereas that of Franklinite is 5.05-5.22.