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The title compound is prepared by solid state reaction of SrCO3, α‐Si3N4, and SiO2 (W crucibles, 1550 °C, 8 h).

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A New Hydrated Ammonium Hydroxyborate, (NH 4 ) 2 [B 10 O 14 (OH) 4 ]·H 2 O. -Title compound (II) crystallizes in the triclinic space group P1 with Z = 3 (single crystal XRD). The structure contains [B10O15(OH)4] 4ions that are linked end-to-end by sharing two common O atoms, thus producing infinite chains of composition [B10O15(OH)4 . The chains are connected by hydrogen bonds to form borate sheets. -(LI, L.-Y.; LI, G.-B.; XIONG, M.; WANG, Y.-X.; LIN*, J.-H.; Acta Crystallogr., Sect. C: Cryst.