Definitions for "Alunite"
Alum stone.
A mineral with the composition KAl2 (SO4)2 (OH)6, and an important alteration product in high-sulphidation epithermal systems;
Alunite, or alumstone, is a mineral that was first observed in the 15th century in Monti della Tolfa, north to Rome, where it was mined for the manufacture of alum. First called aluminilite by J.C. Delametherie in 1707, this name was contracted by François Beudant in 1824 to alunite.
Hydrous potassium aluminum sulfate. White, yellow, grey or red. (3.5 - 4)