æt ɹˈuːm tˈɛmpɹɪtʃɚ, ɪt hɐz ˌɔːɹθoːɹhˈɑːmbɪk stɹˈʌktʃɚ wɪð spˈeɪs ɡɹˈuːp pˌiːˌɛnˌɛmˈeɪ bˈeɪɾəwˌaɪˈɛf θɹˈiː tˈaɪp wɪð lˈæɾɪs kˈɑːnstənts ɐ ˈiːkwəlz sˈɪkshˈʌndɹɪd sˈɪksti sˈɪks,nˈaɪn pˌiːˈɛm, bˈiː ˈiːkwəlz sˈɛvənhˈʌndɹɪd fˈaɪv,nˈaɪn pˌiːˈɛm, sˈiː ˈiːkwəlz fˈoːɹhˈʌndɹɪd fˈoːɹɾi,fˈaɪv pˌiːˈɛm.
At room temperature, it has orthorhombic structure with space group Pnma – β-YF3 type with lattice constants a = 666,9 pm, b = 705,9 pm, c = 440,5 pm.