Biotite and Bustamite Physical Properties

Biotite

Bustamite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Not Available

Partly soluble in HCl.

1.3 Durability

Not Available

1.4 Specific Gravity

2.7-3.33.32-3.43

1 7.18

1.5 Fracture

Uneven, Even, Yellow, White

ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)

1.6 Cleavage

Perfect on the {001}

{100} perfect; {110} and {1 1 0} good; {010} poor

1.7 Mohs Hardness

2.5-3.05.5-6

2 10

1.8 Chemical Composition

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

(Ca,Mn2+ )Si 3O 9Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Biotite and Bustamite Chemical Formula

While comparing Biotite and Bustamite 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 Bustamite chemical formula.

Chemical formula of Biotite- K(Mg,Fe++)3[AlSi3O10(OH,F)2
Chemical formula of Bustamite- (Ca,Mn2+ )Si 3O 9Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Biotite and Bustamite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Biotite and Bustamite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Biotite and Bustamite Optical Properties during the identification of gemstone. Specific gravity of Biotite is 3.32-3.43 whereas that of Bustamite is 3.32-3.43.