Hostname: page-component-78c5997874-j824f Total loading time: 0 Render date: 2024-11-10T09:25:12.172Z Has data issue: false hasContentIssue false
  • English
  • Français

Manganese minerals in geodes from Chihuahua, Mexico1

Published online by Cambridge University Press:  05 July 2018

Robert B. Finkelman ,
Howard T. Evans Jr  and
John J. Matzko
Robert B. Finkelman
Affiliation:
U.S. Geological Survey, Washington, D.C. 20242
Howard T. Evans Jr
Affiliation:
U.S. Geological Survey, Washington, D.C. 20242
John J. Matzko
Affiliation:
U.S. Geological Survey, Washington, D.C. 20242
Get access Rights & Permissions [Opens in a new window]

Summary

Seven manganese minerals have been observed in geodes from Chihuahua, Mexico. Ramsdellite occurs in a number of different habits, but the morphology and precession X-ray patterns suggest that it is pseudomorphous after groutite. Pyrolusite is found only in association with rams-dellite and is believed to be an alteration product of that mineral. Todorokite generally occurs as a late-stage fibrous overgrowth in many of the geodes. Ranciéite, birnessite, hollandite, and cryptomelane are present in trace amounts. This assemblage of manganese minerals is typical of supergene mineralization.

Type
Research Article
Information
Mineralogical Magazine , Volume 39 , Issue 305 , March 1974 , pp. 549 - 558
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1974

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Avaliani, (G.), Nizharadze, (N. V.), and Abakeliya, (N. M.), 1970. [New minerals in Chiatura manganese ore. Nauk Konf. Gruz. Politeck Inst. Trudy no. 6, 142-7] (Chem. Abs. 74, no. 22, I14196, 1971).Google Scholar
Bricker, (Owen), 1965. Amer. Min., 50, 1296–354.Google Scholar
Brown, (F. H.), Panst, (A.), and Sawyer, (D. L.), 1971. Ibid. 56, 1057-64.Google Scholar
Bystrom, (A. M.), 1949. Acta Chemica Scandinavica, 3, 163-73.CrossRefGoogle Scholar
Cronan, (D. S.) and Tooms, (J. S.), 1969. Deep-Sea Res., 16, 335–59.Google Scholar
Deer, (W. A.), Howle, (R. A.), and Zussman, (J.), 1962. Rock-forming minerals. New York (John Wiley and Sons).Google Scholar
Finkelman, (R. B.), Matzko, (J. J.), Woo, (C. C.), White, (J. S. Jr.) and Brown, (W. R.), 1972. Mineral Record,, 3, 2o5-12.Google Scholar
Fleischer, (Michael) and Richmond, (Wallace), 1943. Econ. Geol., 38, 269–86.CrossRefGoogle Scholar
Fleischer, (Michael) and Evans, (H. T.) Jr., 1962. Amer. Min., 47, 47–58.Google Scholar
Glasby, (G. P.), 1972. Marine Geol., 13, 57–72.CrossRefGoogle Scholar
Gruner, (J. W.), 1947. Amer. Min., 32, 654–9.Google Scholar
Jones, (L. H. P.) and Milne, (A. A.), 1956. Min. Mag., 31, 283–8.Google Scholar
Klingsberg, (Cyrus) and Roy, (Rustum), 1959. Amer. Min., 44, 819-38.Google Scholar
Levinson, (A. A.), 1962. Ibid. 47, 790-1.Google Scholar
Mckenzie, (R. M.), 197I. Min. Mag., 38, 493–502.Google Scholar
Richmond, (W. E.), FLEISCHER (MICHAEL), and Mrose, (M. E.), 1969. Bull. Soc. franc. Min. Crist., 92, 19I-5.Google Scholar
Sinotte, (S. R.), 1969. The fabulous Keokuk geodes,, 1. DesMoines, Iowa (Wallace-Holmestead Co.).Google Scholar
Straczek, (J. A.), Horen, (A.), Ross, (M.), and Warshaw, (C. M.), 196o. Amer. Min., 45,1174-84.Google Scholar
Trask, (P. D.) and Cabo, (J. R. Jr.), 1948. U.S. Geol. Surv. Bull., 954-F,2o9-3t5.Google Scholar
Wilson, (I. F.) and Rocha, (V. S.), 1948. ibid. 954-E, 181-208.Google Scholar