əbˌʌv fˈoːɹhˈʌndɹɪd nˈaɪnti fˈaɪv dᵻɡɹˈiːz sˈiː, ɪt hɐz ðə ɹˌɑːmboʊhˈiːdɹəl lˌæ ˈɛf θɹˈiː stɹˈʌktʃɚ spˈeɪs ɡɹˈuːp pˈiː θɹˈiː sˌiːˈɛl wɪð lˈæɾɪs kˈɑːnstənts ɐ ˈiːkwəlz sˈɛvənhˈʌndɹɪd sˈɛvən, sˈiː ˈiːkwəlz sˈɛvənhˈʌndɹɪd twˈɛnti fˈoːɹ pˌiːˈɛm.
Above 495 °C, it has the rhombohedral  LaF3 structure (space group P3cl) – with lattice constants a = 707, c = 724 pm.