Andalusite and Anhydrite Physical Properties
Specific Gravity
3.05-3.21
2.90-2.98
Fracture
Uneven, Subconchoidal, Splintery
Conchoidal
Cleavage
Good on {110}, poor on {100}
Rare tabular and prismatic crystals. Usually occurs as fibrous, parallel veins that break off into cleavage fragments.
Chemical Composition
Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
CaSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Andalusite and Anhydrite Chemical Formula
While comparing Andalusite and Anhydrite 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 Anhydrite chemical formula.
- Chemical formula of Andalusite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
- Chemical formula of Anhydrite- CaSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Andalusite and Anhydrite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Andalusite and Anhydrite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Andalusite and Anhydrite Optical Properties during the identification of gemstone. Specific gravity of Andalusite is 2.90-2.98 whereas that of Anhydrite is 2.90-2.98.