Lollingite is an iron arsenate and part of the Lollingite Group. It forms orthorhombic, prismatic, also pyramidal, silver-white, metallic crystals; also massive. It occurs primarily in mesothermal vein deposits associated with other sulfides, or in pegmatites. Lollingite was named in 1845 by Wilhelm Karl von Haidinger for the type locality at Wolfbau mine, Lolling district, Huttenberger Erzberg, Huttenberg, Friesach - Huttenberg area, Carinthia, Austria. Lollingite is found widespread in the pegmatites of the Black Hills of South Dakota; Gunnison and San Juan Counties of Colorado; Amador, Inyo, Riverside, and San Diego Counties, California; Franklin and Ogdensburg, New Jersey, USA; Cobalt district, Ontario, Canada. It is also found in Bolivia, Chile, Spain, Germany, and Norway.
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