Hutchinsonite, (Pb,Tl)2As5S9 with Baryte (2,5 cm)
Quiruvilca, Peru.
Collection Pierre Perroud (now in NHM Geneva). Won at a tombola of Société Genevoise de Minéralogie (SGAM) 1986!
Photo Phillipe Wagneur, MHN Genève. © Athena 2016