Elbaite and Biotite Physical Properties

Elbaite

Biotite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.90-3.102.7-3.3

1 7.18

1.5 Fracture

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

Uneven, Even, Yellow, White

1.6 Cleavage

Poor/indistinct on {1120} and {1011}

Perfect on the {001}

1.7 Mohs Hardness

72.5-3.0

2 10

1.8 Chemical Composition

Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) More from other references

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

Elbaite and Biotite Chemical Formula

While comparing Elbaite and Biotite 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 Elbaite and Biotite chemical formula.

Chemical formula of Elbaite- Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) More from other references
Chemical formula of Biotite- K(Mg,Fe++)3[AlSi3O10(OH,F)2

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Elbaite and Biotite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Elbaite and Biotite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Elbaite and Biotite Optical Properties during the identification of gemstone. Specific gravity of Elbaite is 2.7-3.3 whereas that of Biotite is 2.7-3.3.