| Reference Type | Journal (article/letter/editorial) |
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| Title | The transformation manganite → pyrolusite |
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| Journal | Mineralogical Magazine |
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| Authors | Champness, P. E. | Author |
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| Year | 1971 (June) | Volume | 38 |
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| Issue | 294 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_38/38-294-245.pdf+ |
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| DOI | doi:10.1180/minmag.1971.038.294.14Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 6465 | Long-form Identifier | mindat:1:5:6465:5 |
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| GUID | 0 |
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| Full Reference | Champness, P. E. (1971) The transformation manganite → pyrolusite. Mineralogical Magazine, 38 (294) 245-248 doi:10.1180/minmag.1971.038.294.14 |
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| Plain Text | Champness, P. E. (1971) The transformation manganite → pyrolusite. Mineralogical Magazine, 38 (294) 245-248 doi:10.1180/minmag.1971.038.294.14 |
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| In | (1971, June) Mineralogical Magazine Vol. 38 (294) Mineralogical Society |
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| Abstract/Notes | SummaryDuring the transformation of manganite to pyrolusite the b-axis must contract about 15 %. There is evidence that the shrinkage takes place partly by contraction of the whole crystal, but electron-microscope investigations of natural pyrolusites and of manganite oxidized in the laboratory show that the reaction also involves the formation of lamellar pores about 85 Å apart, parallel to (010) of the original manganite. Thus, although pyrolusite is tetragonal, the a- and b-axes are not microscopically identical, a fact which could explain why, when natural pyrolusite is treated hydrothermally at 200 and 300 °C and 1000 bars, only one orientation of manganite is formed (Dent Glasser and Smith, 1968). The pores and the accompanying distortion of the structure act as a ‘memory’ of the parent phase. |
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