Rammelsbergite is a nickel arsenide mineral with formula NiAs2.
It was first described in 1854 from its type locality in the Schneeberg District in Saxony, Germany.
It was named after the German chemist and mineralogist, Karl Friedrich August Rammelsberg (1813–1899).
[3] It occurs as a hydrothermal mineral in medium temperature veins association with skutterudite, safflorite, lollingite, nickeline, native bismuth, native silver, algodonite, domeykite and uraninite.
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