Biotite and Pyrophyllite Physical Properties
Tenacity
Brittle
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
2.7-3.3
2.65-2.90
Fracture
Uneven, Even, Yellow, White
Gemstones (2009), Flexible Flexible fragments.
Cleavage
Perfect on the {001}
{001} Perfect
Mohs Hardness
2.5-3.0
Not Available
Chemical Composition
K(Mg,Fe++)3[AlSi3O10(OH,F)2
Al 2Si 4O 10(OH) 2Michael OâDonoghue , 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 OâDonoghue , 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.