Godovikovite is a rare mineral of the chemical formula: (NH₄)Al(SO₄)₂. Al can partially be substituted by Fe. Hydratation of godovikovite gives the ammonium alum, tschermigite

Tschermigite

Tschermigite is a mineral form of ammonium alum, formula NH4AlSO4·12H2O. It is found in burning coal seams, bituminous shale and fumaroles. Because of its extreme water solubility it is unlikely to persist except in the dryest of conditions. Discovered in 1852 at Cermiky, also known as Schermig...

. The mineral forms cryptocrystalline, often porous, masses, usually of white colour. Single crystals are very small hexagonal blades. Typical environment for godovikovite are burning coal sites (mainly dumps). There the mineral acts, together with millosevichite

Millosevichite

Millosevichite is a rare mineral with the chemical formula Al23. Aluminium is often substituted by iron. It forms white to yellowish cryptocrystalline, often porous, masses. The mineral is mainly known from burning coal dumps, acting as one of the main minerals forming sulfate crust. It can be also...

, as one of the main components of so-called sulfate crust.