Andalusite and Biotite Physical Properties

Andalusite and Biotite Chemical Formula

While comparing Andalusite 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 Andalusite and Biotite chemical formula.

• Chemical formula of Andalusite- Al 2SiO 5Michael O’Donoghue , Gems, Sixth edition (2006) More from other references
• Chemical formula of Biotite- K(Mg,Fe++)3[AlSi3O10(OH,F)2

Andalusite and Biotite Specific Gravity

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