| Reference Type | Journal (article/letter/editorial) |
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| Title | The transformation of groutite (α-MnOOH) into pyrolusite (MnO2) |
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| Journal | Mineralogical Magazine and Journal of the Mineralogical Society |
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| Authors | Lima-De-Faria, J. | Author |
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| Lopes-Vieira, A. | Author |
| Year | 1964 (September) | Volume | 33 |
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| Issue | 266 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_33/33-266-1024.pdf+ |
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| DOI | doi:10.1180/minmag.1964.033.266.10Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 5819 | Long-form Identifier | mindat:1:5:5819:7 |
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| GUID | 0 |
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| Full Reference | Lima-De-Faria, J., Lopes-Vieira, A. (1964) The transformation of groutite (α-MnOOH) into pyrolusite (MnO2) Mineralogical Magazine and Journal of the Mineralogical Society, 33 (266) 1024-1031 doi:10.1180/minmag.1964.033.266.10 |
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| Plain Text | Lima-De-Faria, J., Lopes-Vieira, A. (1964) The transformation of groutite (α-MnOOH) into pyrolusite (MnO2) Mineralogical Magazine and Journal of the Mineralogical Society, 33 (266) 1024-1031 doi:10.1180/minmag.1964.033.266.10 |
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| In | (1962) Mineralogical Magazine Vol. 33 (266) Mineralogical Society |
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| Abstract/Notes | SummaryThe transformation of groutite (α-MnOOH) by heating has been studied at 300° C in air, by single-crystal and powder X-ray methods. At this temperature groutite transforms topotactically into pyrolusite (MnO2), the a, b, and c axes of groutite becoming respectively the a, b, and c axes of pyrolusite (in pyrolusite b = a). At various stages of the transformation other weak and diffuse spots were observed on X-ray oscillation photographs, which could not be ascribed to pyrolusite. Some of these extra spots fit well to an α-Mn2O3 structure (isostructural with hematite), with c 14·3 and a 4·9 Å; the other few spots could not be identified.The transformation of α-MnOOH into MnO2 is explained by a homogeneous mechanism, with migration of protons and electrons to the crystal surface. A detailed interpretation of this mechanism is presented on the basis of the close-packing characteristics of these two structures. |
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