Polymorphism can extend further than pure symmetry articles. The aluminosilicates are a bunch of three minerals – kyanite, andalusite, and sillimanite – which share the chemical formulation Al2SiO5. Kyanite is triclinic, whilst andalusite and sillimanite are both of those orthorhombic and belong to the dipyramidal issue group. These dissimila… Read More