Multi-stage pyrite genesis and epigenetic selenium enrichment of Greenburn coals (East Ayrshire) BullockLiam A. ParnellJohn PerezMagali BoyceAdrian FeldmannJoerg ArmstrongJoseph G.T. 2018 LA–ICP–MS maps for Fe, Se, Ag, As, Cu, Hg, Pb and Te for Greenburn coal samples from seams 9300 Lime and 6900 Burnfoot Bridge.