Aerugite is a rare complex nickel mineral with a variably reported formula: Ni9(AsO4)2AsO6. It forms green to deep blue-green trigonal of 4 and a specific gravity of 5.85 to 5.95.
It was first described in 1858 in either the South Terres mine of Cornwall , Saxony. The origin is disputed. The most common occurrence is as an incrustation on furnace walls in which ores are roasted. Its name comes from the Latin word aerugo for copper rust.