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The structure of the title compound, Sr-bearing oxonitrido­aluminosilicate (Sr-sialon), contains two types of channels running along the  a  axis, with the three unique Sr atoms (coordinatioon number seven) residing in the larger one. The channels cross a three-dimensional Si–Al–O–N network, in which the Si and Al atoms are in a tetra­hedral coordination with N and O atoms. The chemical composition of the crystal is close to Sr 3 Al 3 Si 13 N 21 O 2  (tris­trontium trialuminium trideca­silicon henicosa­nitride dioxide), which can be expressed as a mixture of SrSiN 2 , Si 3 N 4 , AlN, and SiO 2  components in the molar ratio 3:3:3:1. The crystal studied was metrically orthorhombic, consisting of four twin components related by metric merohedry.

acta crystallographica. section e

Sr3(Al3+xSi13−x)(N21−xO2+x):Eu2+(x∼ 0): a monoclinic modification of Sr-sialon