Abstract Sr-substitution in the crystal structure of bredigite has been studied detail. Samples a hypothetical solid-solution series with nominal composition Ca 7-x Sr x Mg[SiO 4 ] (x = 0, 2, …,7) have prepared from sinter reactions temperature range between 1275 and 1325 °C characterized using powder single-crystal X-ray diffraction. Synthesis runs 1 resulted compounds increasing contents, for...