This description of the minerals of Arizona has been largely compiled from publications and manuscripts. Numerous persons were also consulted regarding undescribed mineral deposits, and much valuable information was given by A. L. Flagg and Edwin Over. The writer is especially indebted to Robert E. Heineman for the use of the mineral files of the Arizona Bureau of Mines and to Dr. Eldred Wilson for editing the manuscript. A complete list of publications on Arizona mineralogy is to be found in the Arizona Bureau of Mines Bulletin No. 146, Bibliography of the Geology and Mineral Resources of Arizona, and it would be impracticable to reproduce here all the references consulted. Material has been drawn freely from many of them, much of it without change. References in the text other than those listed below are to Bulletin 146. 82 p.