Alum

Alum was a metallic mineral ore. It was a double sulfate composed of a trivalent metal, aluminium, and a univalent metal, potassium or sodium, used as either a clarifying agent or a hardening agent. Overexposure to fumes could lead to alum mineral sickness, a common affliction of alum miners such as Haldo. Alum was a common material in the production of Mandalorian armor, though the incredibly resilient properties of beskar iron made it the preferred choice for armor crafting among Mandalorians.