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Adams Mine (Iberri Mine), Picketpost Mountain area, Superior, Superior District, Pinal Co., Arizona, USA

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A former surface perlite mine located in sec. 9, T2S, R12E, about 1½ miles NE of Picketpost Mountain, and about 2½ miles SW of Superior, on National Forest land. Estimated location, unknown precision. NOTE: Perlite deposits in the vicinity of Picketpost Mountain may contain Apache Tears.

Mineralization is perlite hosted in Arnett Rhyolite and obsidian. The mineralized zone is 13.72 meters thick.

Assay data: Perlite is light grey to milky white. It has strongly developed spheroidal perlitic structures, from a millimeter to several tens of centimeters in diameter, and are successively superimposed on one another. The main mass of perlite cotnains several percent water.

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The above list contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


Wilson, E.D. and Roseveare, G. (1945) Arizona Perlite: Arizona Bureau of Mines, University of Arizona, Circular 12 10 pp.

Peterson, D.W. (1966) The Geology of Picketpost Mountain, Northeast Pinal County, Arizona. Arizona Geological Society Digest: 8: 159-176.

USGS & Arizona Bureau of Mines & U.S. Bureau of Reclamation, Mineral and Water Resources of Arizona, Arizona Bureau of Mines Bull. 180 (USGS Bull.871), 638 pp.

Eyde, Ted, Wilkinson, P.A.K., and Weiland, E.F. (1986) Field Trip to Selected Industrial Mineral Deposits of Arizona, in Beatty, Barbara, and Wilkinson, P.A.K., editors, Frontiers in Geology and Ore Deposits of Arizona and the Southwest. Arizona Geological Society Digest vo. XVI: 312-318.

Phillips, K.A. (1987), Arizona Industrial Minerals, 2nd. Edition, Arizona Department of Mines & Minerals Mineral Report 4, 185 pp.

Peirce, H. Wesley (1990), Arizona Geological Survey Industrial Minerals card file.

MRDS database Dep. ID #10060369, MRDS ID #TC10748.

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