title: Pyrite Group: An Unusual Member: Cu0.60Ni0.14Co0.03Fe0.23S2.
abstract: An investigation of villamaninite from the type locality indicates that former analyses were of aggregates rather than of individual minerals. A redefinition embraces a larger range of solid solution, the end-member of which has the highest content of copper so far attributed to a member of the pyrite family.
authors.forename: P J
authors.initials: PJ
authors.lastname: Ypma