| Reference Type | Journal (article/letter/editorial) |
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| Title | The structural role of Fe 3+ in biotites from the Euganean Hills, Italy |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | De Pieri, Renzo | Author |
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| Year | 1980 (December) | Volume | 43 |
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| Issue | 332 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_43/43-332-985.pdf+ |
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| DOI | doi:10.1180/minmag.1980.043.332.05Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 3186 | Long-form Identifier | mindat:1:5:3186:2 |
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| GUID | 0 |
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| Full Reference | De Pieri, Renzo (1980) The structural role of Fe 3+ in biotites from the Euganean Hills, Italy. Mineralogical Magazine, 43 (332) 985-988 doi:10.1180/minmag.1980.043.332.05 |
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| Plain Text | De Pieri, Renzo (1980) The structural role of Fe 3+ in biotites from the Euganean Hills, Italy. Mineralogical Magazine, 43 (332) 985-988 doi:10.1180/minmag.1980.043.332.05 |
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| In | (1980, December) Mineralogical Magazine Vol. 43 (332) Mineralogical Society |
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| Abstract/Notes | SummaryPlots of partition coefficient (mineral/matrix) against ionic radius of the elements in seventeen biotites from trachytes and rhyolites of the Euganean Hills do not show differences in the type of diagram between the biotites with tetrahedral sites completely filled by Si and Al, and those in which filling is only possible with the intervention of Fe3+ (or Ti4+) since these sites are incompletely filled by Si and Al. This behaviour seems to exclude, for the latter, the presence of Fe3+ (or Ti4+ in the tetrahedral site. Similar indications are given by structural analysis. The possibility of existence of [(OH)4]4− groups or, more probably, vacancies in these sites is therefore suggested. The consequences that these results would have on the possibility of correct calculation of the crystallo-chemical formula are discussed. |
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