Tenailleau C , Etschmann B , Ibberson R M , Pring A , American Mineralogist , 91 (2006) p.1442-1447, A neutron powder diffraction study of Fe and Ni distributions in synthetic, pentlandite and violarite using 60Ni isotope, Locality: synthetic, Sample: T = 25 C, annealed at 150 C for t = 2 months after high-T expirement