Biotite and Sugilite Physical Properties

Biotite

Sugilite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.3 Solubility

Not Available

1.5 Durability

Not Available

1.6 Specific Gravity

2.7-3.32.69-2.79

1 7.18

1.7 Fracture

Uneven, Even, Yellow, White

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

1.8 Cleavage

Perfect on the {001}

Poor on {0001}

1.9 Mohs Hardness

2.5-3.05.5-6.5

2 10

1.15 Chemical Composition

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

KNa 2(Fe3+ ,Mn3+ ,Al) 2Li 3Si 12O 30Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Biotite and Sugilite Chemical Formula

While comparing Biotite and Sugilite 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 Sugilite chemical formula.

Chemical formula of Biotite- K(Mg,Fe++)3[AlSi3O10(OH,F)2
Chemical formula of Sugilite- KNa 2(Fe3+ ,Mn3+ ,Al) 2Li 3Si 12O 30Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Biotite and Sugilite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Biotite and Sugilite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Biotite and Sugilite Optical Properties during the identification of gemstone. Specific gravity of Biotite is 2.69-2.79 whereas that of Sugilite is 2.69-2.79.