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Picketpost Mountain Perlite deposit, Picketpost Mountain, Superior, Superior District, Pinal Co., Arizona, USA

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A perlite occurrence located in sec. 18, T2S, R12E, about 2½ miles SW of Superior, on National Forest land.

Mineralization is perlite hosted in Arnett Rhyolite. Glassy perlitic flows underlie glassy rhyolite and overlie tuff and breccia. Perlite is light gray to milky white. Strongly developed spheroidal perlitic structures, from a millimeter to several tens of centimeters in diameter, are successfully superimposed on one another. The main mass of perlite contains several percent water.

NOTE: Perlite deposits in the vicinity of Picketpost Mountain may contain Apache Tears.

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References

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.

Yale Peabody GNIS database (NOTE: this database is derived from USGS 1:24,000 topographic map data).

MRDS database Dep. ID #10060371, MRDS ID #TC10750.

Mineral and/or Locality  
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