Purpurite and Biotite Physical Properties

Purpurite and Biotite Chemical Formula

While comparing Purpurite 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 Purpurite and Biotite chemical formula.

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

Purpurite and Biotite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Purpurite and Biotite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Purpurite and Biotite Optical Properties during the identification of gemstone. Specific gravity of Purpurite is 2.7-3.3 whereas that of Biotite is 2.7-3.3.