Milleriet (β-NiS) uit het Boven-Carboon van Limburg en omgeving

Since a number of years, the author has been carrying out a thorough mineralogical study of the dump site of the former Emma and Hendrik collieries at Brunssum (southern Limburg, The Netherlands). The lead and zinc sulfides occuring here are of hydrothermal origin. In addition to sphalerite, galena and chalcopyrite, millerite (ß-NiS) occurs as a rare component. During the production phase of the Limburg collieries it had observation substantiated in the present paper. The systematic position of millerite is discussed, as are literature sources recording the occurence of millerite in Upper Carboniferous deposits of the German Ruhr area in particular. In that area, the productive Carboniferous has yielded large amounts of ores, which have been intensively studied. The recent Brunssum millerite finds occur as messing yellow acicular crystals, on some of which are seen secondary products (annabergite ?). Regulary a number of crystals are found to have coalesced.