“Group of pyrolusite 'blades' on cryptomelane. XRD analyzed. This image was originally published in: Alves, P. and Kampf, A.R. (2017) A mina de ferro e manganês da Herdade dos Pendões, Odemira, sudoeste de Portugal. Acopios, 8: 17-62. Free download here: https://issuu.com/malacate/docs/acopios_8-03 ”