Pargasite and Biotite Physical Properties
Tenacity
Not Available
Brittle
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
3.04-3.26
2.7-3.3
Fracture
Splintery, Brittle, Uneven
Uneven, Even, Yellow, White
Cleavage
{110} perfect
Perfect on the {001}
Mohs Hardness
5-6
2.5-3.0
Chemical Composition
NaCa 2(Mg 4Al)Si 6Al 2O 22(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)
K(Mg,Fe++)3[AlSi3O10(OH,F)2
Pargasite and Biotite Chemical Formula
While comparing Pargasite 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 Pargasite and Biotite chemical formula.
- Chemical formula of Pargasite- NaCa 2(Mg 4Al)Si 6Al 2O 22(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)
- Chemical formula of Biotite- K(Mg,Fe++)3[AlSi3O10(OH,F)2
Pargasite and Biotite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Pargasite and Biotite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Pargasite and Biotite Optical Properties during the identification of gemstone. Specific gravity of Pargasite is 2.7-3.3 whereas that of Biotite is 2.7-3.3.