Pirquitas (sector Oploca, level 7 1/4), Jujuy, Argentina
Small Cabinet, 6.2 x 4.4 x 3.9 cm
ex. Dr. Werner Paar Collection TOYOHAITE, in crystals (!!) is super-rare. This specimen features 4 sub-mm but eye-visible crystals clearly contrasted upon the sparkling sulfide matrix. It has a display quality, that is nice. All crystals are nicely protected in a shallow cavity, as well. This is the Ag-rich end member of the rhodostannite-toyohaite solid solution series. A very rare mineral originally described from the Toyoha mine in Japan where it occurred in microscopic grains only. For the first time, the new occurrence in Argentina provides large crystals of this species (+/- 1 mm) grown on franckeite-potosiite, and associated with other rare minerals like pirquitasite, cylindrite and fizelyite-ramdohrite. The mineral has a "pseudo-cubic" shape and looks like pyrrhotite. Only very few specimens with crystals were recovered, and chances to find additional material are almost none. A "must" for any collector of rare Ag minerals. The mineral was microprobed and almost exaxctly correponds to the end member composition