| Aerugite | |
| Category: | Arsenate minerals |
| Formula: | Ni9(AsO4)2AsO6 |
| Imasymbol: | Aru[1] |
| Strunz: | 8.BC.15 |
| Color: | Grass green, blue-green |
| Habit: | Massive to crystalline crusts |
| System: | Trigonal |
| Class: | Hexagonal scalenohedral (m) H-M symbol: (2/m) |
| Symmetry: | Rm |
| Mohs: | 4 |
| Luster: | Adamantine |
| Streak: | light green, greenish white |
| Diaphaneity: | Opaque to semitransparent |
| Gravity: | 5.85–5.95 |
| References: | [2] [3] [4] |
Aerugite is a rare complex nickel arsenate mineral with a variably reported formula: Ni9(AsO4)2AsO6. It forms green to deep blue-green trigonal crystals. It has a Mohs hardness 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, England or in the Ore Mountains, Saxony, Germany. 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.