| Reference Type | Journal (article/letter/editorial) |
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| Title | The crystal structure of stilpnomelane. Part III: Chemistry and physical properties |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Eggleton, R. A. | Author |
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| Chappell, B. W. | Author |
| Year | 1978 (September) | Volume | 42 |
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| Issue | 323 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_42/42-323-361.pdf+ |
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| DOI | doi:10.1180/minmag.1978.042.323.06Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 2936 | Long-form Identifier | mindat:1:5:2936:4 |
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| GUID | 0 |
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| Full Reference | Eggleton, R. A., Chappell, B. W. (1978) The crystal structure of stilpnomelane. Part III: Chemistry and physical properties. Mineralogical Magazine, 42 (323) 361-368 doi:10.1180/minmag.1978.042.323.06 |
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| Plain Text | Eggleton, R. A., Chappell, B. W. (1978) The crystal structure of stilpnomelane. Part III: Chemistry and physical properties. Mineralogical Magazine, 42 (323) 361-368 doi:10.1180/minmag.1978.042.323.06 |
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| In | (1978, September) Mineralogical Magazine Vol. 42 (323) Mineralogical Society |
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| Abstract/Notes | SummaryFull chemical analysis, cell dimensions, γ refractive index, density, and infra-red absorption spectrum have been determined for fourteen stilpnomelanes. Coupled with data from previously described material and electron probe analyses of three further samples, the new information shows that γ = 1·616+0·0047 Fe3+ −0·0037 Mg; substitution of Mn for Fe appears to have little effect on γ. For ferrostilpnomelane, D = 2·85−0·011 Mg, for ferristilpnomelane, D = 2·89−0·011 Mg. Cell dimensions clearly distinguish ferro-, ferri-, and man-ganstilpnomelanes; for ferri-stilpnomelane a = 22·03−0·00446 Mg−0·00786 Fe3+ (Å). A convenient approximation to the structural formula using a ⅛ subcell, is K0·6(Mg, Fe2+Fe3+)6Si8Al(O,OH)27 2–4 H2O. |
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