ðə ɹˌɑːmboʊhˈiːdɹəl fˈeɪz ɪz pɹədˈuːst æt hˈaɪ tˈɛmpɹɪtʃɚz ænd pɹˈɛʃɚz ɔːɹ wɛn jˈuːzɪŋ nˈɑːnˌiːkwɪlˈɪbɹiəm ɡɹˈoʊθ mˈɛθədz.
The rhombohedral phase is produced at high temperatures and pressures or when using non-equilibrium growth methods.