Geocronite-Jordanite and Fluorite, Milpo Mine, Cerro de Pasco, Pasco, Peru

The January-February 2024 (volume 55) issue of the Mineralogical Record recently shed light on the black sulfosalts that were sharing the spotlight with beautiful green fluorite emerging from Peru. Along with bournonite, pyrite and galena are geocronite and jordanite; both lead-antimony-arsenic sulphides, but impossible to differentiate without chemical analysis. We have several specimens recently sourced several of these rare yet beautiful specimens from a good friend in Peru.

Out of all the specimens we have, I feel this one has the nicest crystals of geocronite-jordanite (and possibly bournonite and galena). The fluorite ranges from light green to a nice emerald green but occasionally has a white coating on it, somewhat dulling the luster compared to our other pieces. The reverse side (not photographed) is richly covered in sulfosalts. From the Milpo Mine, Cerro de Pasco, Pasco, Peru. Dimensions: 4 cm x 7 cm