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Polymorphism can extend over and above pure symmetry content. The aluminosilicates are a gaggle of 3 minerals – kyanite, andalusite, and sillimanite – which share the chemical formula Al2SiO5. Kyanite is triclinic, while andalusite and sillimanite are both orthorhombic and belong into the dipyramidal place team. These dissimilarities come up