Menezesite, the first natural heteropolyniobate, from Cajati, São Paulo, Brazil: description and crystal structure - Atencio, Daniel; Coutinho, José Moacyr Vianna; Doriguetto, Antonio Carlos; Mascarenhas, Yvonne Primerano; Ellena, Javier; Ferrari, Viviane Carillo (American Mineralogist, 2008)