Biotite and Pleonaste Physical Properties

Biotite

Pleonaste

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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

2.7-3.33.80

1 7.18

1.5 Fracture

Uneven, Even, Yellow, White

Not Available

1.6 Cleavage

Perfect on the {001}

Not Available

1.7 Mohs Hardness

2.5-3.08

2 10

1.8 Chemical Composition

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

(Mg,Fe)Al 2O 4Gemdat.org , Management Team (2012)

Biotite and Pleonaste Chemical Formula

While comparing Biotite and Pleonaste 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 Pleonaste chemical formula.

Chemical formula of Biotite- K(Mg,Fe++)3[AlSi3O10(OH,F)2
Chemical formula of Pleonaste- (Mg,Fe)Al 2O 4Gemdat.org , Management Team (2012)

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Biotite and Pleonaste Specific Gravity

Another important criteria for qualitative analysis of gemstones is Biotite and Pleonaste Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Biotite and Pleonaste Optical Properties during the identification of gemstone. Specific gravity of Biotite is 3.80 whereas that of Pleonaste is 3.80.