Ref.: Smith, Russell (1966) Geology of the Cerro Colorado Mountains, Pima County, Arizona: Arizona Geological Society Digest: 8: 131-145, 1 sheet, scale 1:25,000.
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 file #10060367, MRDS ID #TC10745.
A perlite deposit area located in the S½SW¼ sec. 6, the W½ & SE¼SE¼ sec. 7, the NW¼ sec. 17, and sec. 18, T20S, R11E, on state land.
Mineralization is a perlite deposit with material ranging from stringers to layers to a total of 60.96 meters thick, hosted in vitrophyre. Alterationis only slight along perlitic cracks.
Dark gray to pinkish-gray stringers of perlitic glass occur in increasing abundance up-section until the perlite becomes a 100-200 foot thick continuous layer. Thin sections of these units reveal a hypocrystalline texture with 60 to 80 percent glass. The glass in the perlite is fresh except for slight alteration along perlitic cracks and contains abundant trichites but no trace of shards or flow texture.
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Map Reference: 31°41'30"N , 111°15'0"W
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