Min. [mod. f. Fr. alun alum + -ITE min. form.; see quot. 1868.] A mineral, also called Alum-stone and Aluminilite (consisting of common alum together with normal hydrate of aluminium (Al K(SO4)2 . 2 Al H3O3), found in the volcanic districts of Italy, etc.), which is the source of the Roman alum.
1868. Dana, Min., 659. It was named Aluminilite by Delametherie in 1797, a long name well changed to Alunite by Beudant in 1824.
1875. Ure, Dict. Arts, I. 109. The alum-stone or alunite is a mineral of limited occurrence, being found in moderate quantity at Tolfa (near Civita Vecchia).
