Biotite and Purpurite Physical Properties

Biotite and Purpurite Chemical Formula

While comparing Biotite and Purpurite 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 Purpurite chemical formula.

• Chemical formula of Biotite- K(Mg,Fe++)3[AlSi3O10(OH,F)2
• Chemical formula of Purpurite- MnPO 4Walter Schumann , Gemstones of the world (2001) More from other references

Biotite and Purpurite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Biotite and Purpurite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Biotite and Purpurite Optical Properties during the identification of gemstone. Specific gravity of Biotite is 3.2-3.4 whereas that of Purpurite is 3.2-3.4.