ðə kjˈuːbɪk sˈiː aɪ ˈeɪɾi, ˈaɪə, nˈoʊ. tˈuːhˈʌndɹɪd sˈɪks stɹˈʌktʃɚɹ ɪz sˈɪmɪlɚ tə ðæt ʌv mˈæŋɡənˌiːz ɹˌoʊmən θɹˈiː ˈɑːksaɪd ænd hˈɛvi tɹˈaɪvələnt lˈænθɐnˌaɪd sˌɛskwɪˈɑːksaɪdz.
The cubic (cI80, Ia), No. 206) structure is similar to that of manganese(III) oxide and heavy trivalent lanthanide sesquioxides.