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The unprecedented nitridomagnesosilicate Sr8Mg7Si9N22 crystallizes in the C2/m(No.12)space group with a = 15.2798(14)(A),b = 7.4691(7)(A),c = 10.9358(10)(A),β = 110.462(3)°and Z = 2.This novel blue phosphor Sr8Mg7Si9N22: Eu2+shows a narrow-band blue emission peaking at 450 nm with an attractive narrow fwhm~38 nm.