Selenium-rich secondary minerals from the Baccu Locci mine (Sardinia, Italy)

Together with chalcomenite, orlandiite and another unnamed lead-copper selenite, a number of additional selenium oxysalts, such as francisite, mandarinoite, olsacherite, schmiederite and selenium-rich varieties of beaverite, brochantite, serpierite, spangolite and sulfur have been observed in the old lead-arsenic mine at Baccu Locci, near Villaputzu, Sardinia (Italy). Owing to these new discoveries, in this locality the series of secondary minerals containing important amounts of selenium is remarkable.