Hydrated aluminium mellitate, Al₂ [C₆ (COO)₆ ].18H₂ O, a tetragonal mineral occurring naturally as honey-yellow crystals, especially in lignite.
First found in seams of lignite in Thuringia, Germany.
Early 19th century; earliest use found in Journal of Natural Philosophy, Chemistry and the Arts. From post-classical Latin mellites (J. F. Gmelin in Linnaeus Systema Naturae (ed. 13, 1793) III. 282) from classical Latin mell-, mel honey + -ītēs, after German Honigstein.