Complementing knowledge about rare sulphates lonecreekite, NH4Fe3+(SO4)2·12 H2O and sabieite, NH4Fe3+(SO4)2: chemical composition, XRD and RAMAN spectroscopy (Libušín near Kladno, the Czech Republic) - Žáček, Vladimír; Škoda, Radek; Laufek, František; Košek, Filip; Jehlička, Jan (Journal of Geosciences, 2019)