| Reference Type | Journal (article/letter/editorial) |
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| Title | Manganese minerals in geodes from Chihuahua, Mexico |
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| Journal | Mineralogical Magazine |
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| Authors | Finkelman, Robert B. | Author |
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| Evans, Howard T. | Author |
| Matzko, John J. | Author |
| Year | 1974 (March) | Volume | 39 |
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| Issue | 305 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_39/39-305-549.pdf+ |
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| DOI | doi:10.1180/minmag.1974.039.305.07Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 6731 | Long-form Identifier | mindat:1:5:6731:1 |
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| GUID | 0 |
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| Full Reference | Finkelman, Robert B., Evans, Howard T., Matzko, John J. (1974) Manganese minerals in geodes from Chihuahua, Mexico. Mineralogical Magazine, 39 (305) 549-558 doi:10.1180/minmag.1974.039.305.07 |
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| Plain Text | Finkelman, Robert B., Evans, Howard T., Matzko, John J. (1974) Manganese minerals in geodes from Chihuahua, Mexico. Mineralogical Magazine, 39 (305) 549-558 doi:10.1180/minmag.1974.039.305.07 |
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| In | (1974, March) Mineralogical Magazine Vol. 39 (305) Mineralogical Society |
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| Abstract/Notes | SummarySeven 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. |
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