Powellite [SEP] named after
occurrence in the Peacock Mine, Adams County, Idaho and named for American explorer and geologist, John Wesley Powell (1834–1902).
It occurs in hydrothermal ore deposits of molybdenum within the near surface oxidized zones. It also appears as a rare mineral phase in pegmatite, tactite and basalt. Minerals found in association with powellite include molybdenite, ferrimolybdite, stilbite, laumontite and apophyllite.
References.
- Palache, C., H. Berman, and C. Frondel (1951) "Dana’s System of Mineralogy", (
Lindgrenite
Lindgrenite is an uncommon copper molybdate mineral with formula: Cu(MoO)(OH). It occurs as tabular to platey monoclinic green to yellow green crystals.
Discovery and occurrence.
It was first described in 1935 for an occurrence in the Chuquicamata Mine, Antofagasta, Chile, and named for Swedish–American economic geologist Waldemar Lindgren (1860–1939) of the Massachusetts Institute of Technology.
Lindgrenite occurs in the oxidized portions of copper–molybdenum bearing sulfide ore deposits. Associated minerals include antlerite, molybdenite, powellite, brochantite, chrysocolla