In Europe, minty green Pumpellyite tufts with
Albite come from Obří důl, Krkonoše Mountain, Bohemia, Czech Republic; and
acicular green crystal groups from the Los Arenales quarry, Torás, Castellón, Spain. The rare Pumpellyite-(Al) comes from the La Flèche Quarry, Bertrix, Belgium.
In the U.S., the most notable region for this mineral is the Keweenaw Peninsula in Keweenaw Co., Michigan, which is also the
type locality. Pumpellyite, including the desirable variety
Chlorastrolite, is found in several of the copper mines in this famous mining region. Chlorastrolite is also well-known from Isle Royale in Lake Superior. Other U.S. localities include Porter Creek, near Healdsburg, Sonoma Co., California; the Tiburon Peninsula, Marin Co., California; Paterson and Prospect Park, Passaic Co., New Jersey; and the O&G Quarry, Southbury, New Haven Co., Connecticut.