| Reference Type | Journal (article/letter/editorial) |
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| Title | Kegelite: infrared spectroscopy and a structural hypothesis |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Braithwaite, R. S. W. | Author |
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| Year | 1991 (March) | Volume | 55 |
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| Issue | 378 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_55/55-378-127.pdf+ |
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| DOI | doi:10.1180/minmag.1991.055.378.11Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 1699 | Long-form Identifier | mindat:1:5:1699:9 |
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| GUID | 0 |
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| Full Reference | Braithwaite, R. S. W. (1991) Kegelite: infrared spectroscopy and a structural hypothesis. Mineralogical Magazine, 55 (378) 127-134 doi:10.1180/minmag.1991.055.378.11 |
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| Plain Text | Braithwaite, R. S. W. (1991) Kegelite: infrared spectroscopy and a structural hypothesis. Mineralogical Magazine, 55 (378) 127-134 doi:10.1180/minmag.1991.055.378.11 |
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| In | (1991, March) Mineralogical Magazine Vol. 55 (378) Mineralogical Society |
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| Abstract/Notes | AbstractThe infrared spectrum of kegelite has been measured and is discussed. The infrared spectra of 1 : 1 molar mixtures of leadhillite with pyrophyllite or with muscovite resemble the spectrum of kegelite, the chemical formula of which is a 1 : 1 stoichiometric sum of those of pyrophyllite and of the leadhillite polymorphs. Kegelite is not a physical mixture of these species, but its structure may be an interlayering of phyllosilicate and leadhillite-like structures within the unit cell. The unit cell parameters of pyrophyllite-1Tc and the leadhillite polymorphs are compatible with each other and can be combined to give a cell with parameters close to those of the kegelite cell. A structural model for kegelite on these bases is suggested, which is also consistent with its thermal analysis. The formula of kegelite can be written as Pb8(SO4)2(CO3)4(OH)4(AlOH)4(Si4O10)2. |
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