Pumpellyite associated with actinolite, epidote, prehnite, chlorite, albite, white mica, titanite, smectite, and calcite is found in tholeiitic dolerites of Late Triassic (Liassic?) age, where it fills veinlets, replaces primary plagioclase and orthopyroxene, and appears in the groundmass. The dolerites, metamorphosed during the Eo-Alpine event, crop out as tectonic blocks several hundred meters in size, covering an approximate area of 0.1 km² next to the town of Archidona, Málaga province, southern Spain.

A 4.0-mm-thick vein filled with compact bundles of needlelike pumpellyite was selected for analysis. Very minor amounts of calcite and smectite appear as a thin wall coating...