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Any form of aluminum sulfate could be called alum, including toxic versions of the chemical. However, the type of alum you find used for pickling and in deodorant is potassium alum, KAl(SO 4) 2 Â·12H 2 O. Sodium aluminum sulfate is a type of alum that is used in commercial baking powder.
Aluminium sulfide or aluminium sulphide is a chemical compound with the formula Al2 S3. This colorless species has an interesting structural chemistry, existing in several forms.The material is sensitive to moisture, hydrolyzing to hydrated aluminium oxides/hydroxides.t higher temperature, the Al(III) centers become randomized to give a defect wurtzite  structure. And at still higher temperatures stabilize the Î³-Al 2 S 3 forms, with a structure akin to Î³-Al 2 O 3. Molecular derivatives of Al 2 S 3 are not known. Mixed Al-S-Cl compounds are however known.