Over the last couple years, the Milpillas Mine has gained fame for its copper minerals, most notably its arurite and malachite after azurite pseudos. The mine has also produced decent cuprite, and interesting cuprite and chrysocolla included agates.
This is a plate of fuzzy looking primary malachite that differs substantially from much of the earlier Milpillas Malachite-- those were almost all pseudmorphs after azurite.
Similar Minerals
NF604 Malachite
Milpillas Mine, Cuitaca, Mun. de Santa Cruz, Sonora, Mexico