AM_Menezesite
Formula: Nb9.22 Ta.36 Ti3.25 Zr2.74 Th.55 Fe.23 Mn.23 Mg.935 Ba2.21 Ca.31 K.53 O54 H48
Name: Menezesite
Unit cell: 13.017 13.017 13.017 90.0 90.0 90.0 , V=2205.63
Space group: IM3 (204)

Atencio D , Coutinho J M V , Doriguetto A C , Mascarenhas Y P , Ellena J , Ferrari V C , American Mineralogist , 93 (2008) p.81-87, Menezesite, the first natural heteropolyniobate, from Cajati, Sao Paulo, Brazil:, description and crystal structure, Locality: Jacupiranga mine, Cajati county, Sao Paulo, Brazil