16s rRNA gene amplicon sequencing data of the iron quadrangle ferruginous caves (Brazil) shows the importance of conserving this singular and threatened geosystem - Lemes, Camila G. C; Villa, Morghana Marina; Felestrino, Érica B; Perucci, Luiza O; Assis, Renata A. B; Cordeiro, Isabella F; Fonseca, Natasha P; Guerra, Lara C. C; Caneschi, Washington L; Moraes, Lauro Â. G; Carmo, Flávio F. do; Kamino, Luciana H. Y; et al. (Diversity, 2021)