Biotite and Axinite Physical Properties

Biotite

Axinite

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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

2.7-3.33.26-3.36

1 7.18

1.5 Fracture

Uneven, Even, Yellow, White

Conchoidal, ConchoidalArthur Thomas, Gemstones (2009)

1.6 Cleavage

Perfect on the {001}

Good on {100}

1.7 Mohs Hardness

2.5-3.06.5-7

2 10

1.8 Chemical Composition

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

(Ca,Fe,Mn,Mg) 3Al 2BSi 4O 15(OH)Walter Schumann , Gemstones of the world (2001) More from other references

Biotite and Axinite Chemical Formula

While comparing Biotite and Axinite 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 Axinite chemical formula.

Chemical formula of Biotite- K(Mg,Fe++)3[AlSi3O10(OH,F)2
Chemical formula of Axinite- (Ca,Fe,Mn,Mg) 3Al 2BSi 4O 15(OH)Walter Schumann , Gemstones of the world (2001) More from other references

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Biotite and Axinite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Biotite and Axinite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Biotite and Axinite Optical Properties during the identification of gemstone. Specific gravity of Biotite is 3.26-3.36 whereas that of Axinite is 3.26-3.36.