Exploring the milarite minerals, Na2Mg5−xMxSi12O30 (M = Co2+, Zn2+, Ni2+, Cu2+) and Na2Mg2.5Ca0.5−xLnxZn2Si12O30 (Ln = Eu3+, Tm3+, Tb3+), towards new colored compounds, white light emission, and oxygen evolution reaction (OER) properties

New transition metal substituted milarite silicates of the general formula A 2 B 2 C[T(2) 3 T(1) 12 O 30 ] were prepared by a conventional solid state technique and their structures were determined by powder X-ray diffraction (PXRD) methods.