TY JOUR TI Cations ordering in minerals with complex composition: P3-sergevanite — the second representative of eudialyte group with primitive cell KW sergevanite KW eudialyte group KW crystal structure KW isomorphism KW key sites KW primitive cell JO Vestnik of geosciences AU . Rastsvetaeva, R.K. PY 2023 IS 0 PB FSBI FIC "Komi Scientific Center of the Ural Branch of the Russian Academy of Sciences"