ɪnðə mˈæɹɪɡnˌæk pɹˈɑːsɛs, ˌɛnbˈiː ænd tˈɑː ɑːɹ sˈɛpɚɹˌeɪɾᵻd baɪ fɹˈækʃənəl kɹˌɪstɐlᵻzˈeɪʃən ʌv kˈeɪ tˈuː tˈɑː ˈɛf sˈɛvən fɹʌm səlˈuːʃənz ʌv hˌaɪdɹəflˈʊɹɹɪk ˈæsɪd.
In the Marignac process, Nb and Ta are separated by fractional crystallization of K2TaF7 from solutions of hydrofluoric acid.