A hexagonal mineral, AgI ; soft, sectile, waxy; normally a secondary mineral; in the oxidized zone of silver deposits from primary ores containing argentite, tennantite or tetrahedrite, and native silver; a source of silver; in arid regions where volcanic rocks are common--Southwestern United States, Mexico, Chile, and Broken Hill, New South Wales, Australia. Formerly called iodyrite or iodite. Compare: chlorargyrite; bromargyrite.