In spite of the improbability that a deposit of barytes in the State of Arizona could be mined profitably under existing conditions, the Arizona Bureau of Mines frequently receives samples of barytes (barite) from all parts of the State together with requests for information concerning the value, properties, uses, etc. of this mineral. The Bureau has, therefore, deemed it advisable to prepare this pamphlet which admittedly covers the barytes industry imperfectly. It is hoped, however, that the facts presented herein will prove helpful to the many prospectors and others whom the Bureau endeavors to serve ; and that, although the distribution of this pamphlet may not stimulate the State's mineral production, it may still be the means of preventing what is very likely to prove a useless expenditure of time and money. For more complete information on the subject the reader may consult the articles and publications listed in the selected bibliography that forms a part of this bulletin. 18 p.