ALUM SCHIST; ALUM SHALE
Al"um schist", Al"um shale", (Min.)
Defn: A variety of shale or clay slate, containing iron pyrites, the decomposition of which leads to the formation of alum, which often effloresces on the rock.
ALUM STONE
Al"um stone`. (Min.)
Defn: A subsulphate of alumina and potash; alunite.
ALUNITE
Al"u*nite, n. (Min.)
Defn: Alum stone.
ALUNOGEN
A*lu"no*gen, n. Etym: [F. alun alum + -gen.] (Min.)
Defn: A white fibrous mineral frequently found on the walls of mines and quarries, chiefly hydrous sulphate of alumina; — also called feather alum, and hair salt.
ALURE Al"ure, n. Etym: [OF. alure, aleure, walk, gait, fr. aler (F. aller) to go.]
Defn: A walk or passage; — applied to passages of various kinds.
The sides of every street were covered with fresh alures of marble.
T. Warton.