ɪt kɹˈɪstəlˌaɪzᵻz ɪn ɐn ˌɔːɹθoːɹhˈɑːmbɪk pluːtˈoʊniəm ɹˌoʊmən θɹˈiː bɹˈoʊmaɪd kɹˈɪstəl stɹˈʌktʃɚ wɪð spˈeɪs ɡɹˈuːp sˌiːˌɛmsˌiːˈɛm nˈoʊ. sˈɪksti θɹˈiː.
It crystallizes in an orthorhombic plutonium(III) bromide crystal structure with space group Cmcm (No. 63).