A weighty, lustrous, polished, vein slice of massive breithauptite, with orange-brown nickeline. SEM-EDS has shown the presence of cobaltite, skutterudite and silver. This silver contains mercury, probably eugenite or kongsbergite, not determined before in this famous mining Cobalt area of Ontario. This sample belongs from the J. Vilaseca collection (Barcelona). Really interesting because nowadays samples like this are quite unusual. We will send all analytical results to the buyer.