:

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    Na4 (Ca, Ce, Fe2+)2 Zr[Si6O17](OH, Cl)2. : TR, Sr, Nb, Ti, K . , , , . 5-6; 2,7-3,1 /3. . - .

    ( .1948)
    (Brazilia)

    (Bachmann) (1926-73)

    :