Ammonium alum (ammonium aluminium sulfate) crystals.

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Photo credit: © Vince F / Alamy / Afripics
License: Royalty Free
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Keywords: 2, alum, aluminium, aluminum, ammonium, background, black, chemical, chemistry, crystal, crystalline, crystals, dish, glass, lab, laboratory, petri, pile, shine, shiny, solid, sulfate, sulphate, white