1) Monoclinic mineral 2) Nickel mineral 
Ahlfeldite ((Ni,Co)[SeO3]·2H2O) is a mineral of secondary origin. It`s named after Friedrich Ahlfeld (1892–1982), a German-Bolivian mining engineer and geologist. Its type locality is Virgen de Surumi mine, Pakajake Canyon, Chayanta Province, Potosí Department, Bolivia. ...