Zincian rancieite from the Kato Nevrokopi manganese deposits, Macedonia, northern Greece

Abstract

At the 25th km main Mn-mine of Kato Nevrokopi, Macedonia, northern Greece, rancieite forms flaky to laminated aggregates encrusting vugs, and replacing pyrolusite and todorokite in massive deposits of the Falakron marbles. It has an unusually high ZnO (1.53-3.07 wt%) content and therefore it was named 'zincian rancieite'. The average (18 spots) chemical composition of rancieite by EPMA is (wt%): MnO2 62.01, CaO 6.83, ZnO 2.54, A1203 1.18, MgO 0.63 plus minor oxides (Fe203, K20 & SiO2), total of 73.98. Assuming H20-content as 26.02 (100 -73.98) wt%, these data reflect the following empirical formula: (Ca0.67Zn0.17A10.12Mg0.09 3+

The dark colour of the Ploutonion at Hierapolis of Phrygiae (Turkey)

“…Ranciéite is characteristically found, for example, in Ca‐rich environments such as travertines, limestones or marbles (Nimfopoulos et al . ), but in the case of the thermal spring water of the Ploutonion , the Ca concentration is not the main factor in determining the precipitation of the ranciéite mineral phase rather than birnessite or todorokite. The mineral species in the manganese was precipitated from hot‐spring water and is therefore dependent on the presence or absence of micro‐organisms (Miura and Hariya ).…”

Electrochemical Behavior of Natural Manganese Oxides: Transforming Mining Waste into Energy Storage Materials

“…The samples collected represent ore from waste piles which are disposed of adjacent to the closed mine sites of Mavro Xylo and "25th Km", Kato Nevrokopi, Drama, Greece. The ore paragenesis in these sites mainly consists of pyrolusite, nsutite (MnO 2 ), and todorokite [Ca,K,Na,Mg,Ba,Mn)(Mn,Mg,Al) 6 O 12 *3H 2 O] at various abundances [23,24]. The mineralogy of the studied samples is verified prior to the experiments by XRD analysis showing that the MLX3 is mostly comprised of nsutite and sample MLX1 is a mixture of nsutite and todorokite with minor matrix calcite.…”