A new orthoborate,Sr3Ga3(BO3)4O(OH)

The crystal structure of tristrontium trigallium tetraborate oxide hydro­xide has been determined by X‐ray diffraction using a crystal grown by hydro­thermal crystallization of a strontium gallo‐borate glass. It represents a new orthoborate structure type built of complex layers formed by BO₃ triangles sharing corners with Ga₂O₇ tetrahedral dimers and GaO₄OH square pyramids. The Sr atoms occupy both inter‐ and intralayer sites.