Polymorphism can lengthen past pure symmetry content material. The aluminosilicates are a bunch of 3 minerals – kyanite, andalusite, and sillimanite – which share the chemical formulation Al2SiO5. Kyanite is triclinic, while andalusite and sillimanite are the two orthorhombic and belong to the dipyramidal point team. These variances arise equ