@article{article7124a38f,
title   = {Melcherite, trigonal Ba2Na2Mg[Nb6O19].6H2O, the second natural hexaniobate, from Cajati, São Paulo, Brazil: description and crystal structure},
author = {Andrade, Marcelo B. and Atencio, Daniel and Menezes Filho, Luiz A. D. and Spratt, John},
year = {2018},
doi = {10.1180/minmag.2017.081.026},
journal   = {Mineralogical Magazine}
}