geological history of the sample. Left: Inclusions of roquesite (greenish grey) in massive bornite (violet grey);...Corundum Rickardite yes medium bluegrey; 16.31 Roquesite Berzelianite low pronounced strong orange to...grey); Himmelsfürst Mine, Brand-Erbisdorf, Freiberg District, Erzgebirge, Sachsen, Germany (sample: Seifert);...quartz (dark grey); New Bullfrog Mine, Bullfrog District, Nye Co., Nevada, USA (sample: Witzke); PPL If...placers Kaietur Falls, Potaro River, Kangaruma District, Potaro-Siparuni Region, Guyana Chalcopyrite, |