Dumortierite Chemical: Al6.5-7BO3(SiO4)3(O,OH)3. Clades: Al2SiO5 group; Nesosilicates; Silicate minerals; Lapidae. rom Related postsCantharis vesicatoriaMarch 10, 2019AugiteFebruary 27, 2021Minuartia circassicaMarch 10, 2019 Previous postKyaniteNext postNorbergite