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loellingite
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Basalt sample returned by Apollo 15, from near a long sinous lunar valley called Hadley Rille. Measured at 3.3 years old.
(Bed) Rocks and (Flint) Stones
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loellingite

mineral
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loellingite, an iron arsenide mineral (FeAs2) that usually occurs with iron and copper sulfides in hydrothermal vein deposits. It typically occurs with impurities of cobalt, nickel, and arsenicā€”as at the Andreas-Berg, in the Ore Mountains (Erzgebirge) of Germany; Andalusia, Spain; and Franklin, New Jersey, U.S. Loellingite is classified in a group of iron, cobalt, and nickel arsenides that form orthorhombic crystals and are called sulfide minerals, though they contain very little sulfur. See sulfide mineral for further information.

This article was most recently revised and updated by Chelsey Parrott-Sheffer.