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Polymorphism can extend beyond pure symmetry content. The aluminosilicates are a gaggle of 3 minerals – kyanite, andalusite, and sillimanite – which share the chemical method Al2SiO5. Kyanite is triclinic, even though andalusite and sillimanite are both equally orthorhombic and belong to the dipyramidal level team. These dissimilarities come