Tags: Chemical Substance, Mineral.
For the igneous rock type websterite see pyroxenite.Aluminite is a hydrous aluminium sulfate mineral with formula: Al2SO4(OH)4·7H2O. It is an earthy white to gray-white monoclinic mineral which almost never exhibits crystal form. It forms botryoidal to mammillary clay-like masses. It has a very soft Mohs hardness of 1 and a specific gravity of 1.66—1.7. It forms in clay and lignite deposits as an oxidation product of pyrite and marcasite along with aluminium silicates.
