emphasise anisotropy effects. Left: The same alabandite sample observed under PPL (top, grey) and XPL...lamellar green, brown (oxidation) bluegreen Alabandite very light yes lemon yellow to redbrown and...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, |