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Very big polished Aluminite mineral from Hungary
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 1–2 and a specific gravity of 1.66–1.82
