ɪt hɐz ɐ spˈeɪs ɡɹˈuːp ˌɑːɹsˈiː nˈoʊ. wˈʌnhˈʌndɹɪd sˈɪksti sˈɛvən, pˈɪɹsən sˈɪmbəl ˈeɪtʃ ˈɑːɹ θˈɜːɾi, ɐ ˈiːkwəlz zˈiəɹoʊ.fˈaɪv θˈaʊzənd fˈoːɹhˈʌndɹɪd ˈeɪɾi sˈɛvən ˌɛnˈɛm, bˈiː ˈiːkwəlz zˈiəɹoʊ.fˈaɪv θˈaʊzənd fˈoːɹhˈʌndɹɪd ˈeɪɾi sˈɛvən ˌɛnˈɛm, sˈiː ˈiːkwəlz wˈʌn.fˈoːɹ θˈaʊzənd fˈaɪvhˈʌndɹɪd tˈɛn ˌɛnˈɛm, zˈiː ˈiːkwəlz sˈɪks ænd kˈælkjʊlˌeɪɾᵻd dˈɛnsᵻɾi sˈɛvən.θˈɜːɾi wˈʌn dʒˈiː slˈæʃ sˌiːˈɛm θɹˈiː.
It has a space group Rc No. 167, Pearson symbol hR30, a = 0.5487 nm, b = 0.5487 nm, c = 1.4510 nm, Z = 6 and calculated density 7.31 g/cm3.