Larimar is a rare blue variety of pectolite found only at Los Chupaderos, about 10 km southwest of Barahona in the Sierra de Bahoruco, southwestern Dominican Republic, where steep hillside basaltic flows host Miocene-aged pectolite lobes colored blue by copper substitution. The stone was first noted by Father Miguel Domingo Fuertes Loren in 1916, but mining didn’t commence until its rediscovery in 1974 by Miguel Méndez and Peace Corps volunteer Norman Rilling; today, over 2,000 vertical shafts dot the mountainside as artisanal miners extract sky-blue to green-blue larimar pods and tailings. Prized for its vivid Caribbean-blue hues, larimar remains the only known locality worldwide for this blue pectolite and is widely used in jewelry and collected by mineral enthusiasts. This is an unusually large and high quality example of the mineral; it has been sliced and polished for display.