N.V. Chukanov, A.M. Skrigitil’, O.V. Kuz’mina, A.Ye. Zadov (1999) Bismutopyrochlore (Bi,U,Ca,Pb)1+x(Nb,Ta)2O6(OH)·nH2O—a new mineral from the Mika pegmatite vein (Eastern Pamirs). Zapiski Vseross. Mineral. Obshch., 128(4), 36–41 (in Russian).

The average of three electron microprobe analyses gave Na2O 0.33, MgO 0.28, Al2O3 0.42, K2O 0.48, CaO 2.57, TiO2 0.32, MnO 0.16, Fe2O3 1.74, Nb2O5 34.17, Ta2O5 8.55, PbO 5.99, Bi2O3 14.61, Sb2O3 1.23, UO2 14.02, La...

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