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Biotite
Biotite

Pyrophyllite
Pyrophyllite



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Biotite
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Pyrophyllite

Biotite and Pyrophyllite Physical Properties

1 Physical Properties
1.1 Tenacity
Brittle
Not Available
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
2.7-3.32.65-2.90
Amber
1 7.18
1.5 Fracture
Uneven, Even, Yellow, White
Gemstones (2009), Flexible Flexible fragments.
1.6 Cleavage
Perfect on the {001}
{001} Perfect
1.7 Mohs Hardness
2.5-3.0Not Available
Amber
2 10
1.8 Chemical Composition
K(Mg,Fe++)3[AlSi3O10(OH,F)2
Al 2Si 4O 10(OH) 2Michael O’Donoghue , Gems, Sixth Edition (2006) More from other references

Biotite and Pyrophyllite Chemical Formula

While comparing Biotite and Pyrophyllite 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 Pyrophyllite chemical formula.

  • Chemical formula of Biotite- K(Mg,Fe++)3[AlSi3O10(OH,F)2
  • Chemical formula of Pyrophyllite- Al 2Si 4O 10(OH) 2Michael O’Donoghue , Gems, Sixth Edition (2006) More from other references

Biotite and Pyrophyllite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Biotite and Pyrophyllite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Biotite and Pyrophyllite Optical Properties during the identification of gemstone. Specific gravity of Biotite is 2.65-2.90 whereas that of Pyrophyllite is 2.65-2.90.