Unique but diverse: some observations on the formation, structure, and morphology of halloysite

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dc.contributor.authorChurchman, G. Jocken_NZ
dc.contributor.authorPasbakhsh, Pooriaen_NZ
dc.contributor.authorLowe, David J.en_NZ
dc.contributor.authorTheng, B.K.G.en_NZ
dc.date.accessioned2016-10-13T23:37:31Z
dc.date.available2016-10-11en_NZ
dc.date.available2016-10-13T23:37:31Z
dc.date.issued2016-10-11en_NZ
dc.description.abstractNew insights from the recent literature are summarised and new data presented concerning the formation, structure and morphology of halloysite. Halloysite formation by weathering always requires the presence of water. Where substantial drying occurs, kaolinite is formed instead. Halloysite formation is favoured by a low pH. The octahedral sheet is positively charged at pH < ~8, whereas the tetrahedral sheet is negatively charged at pH > ~2. The opposing sheet charge would facilitate interlayer uptake of H₂O molecules. When halloysite intercalates certain polar organic molecules, additional (hkl) reflections appear in the X-ray diffractogram, suggesting layer re-arrangement which, however, is dissimilar to that in kaolinite. Associated oxides and oxyhydroxides of Fe and Mn may limit the growth of halloysite particles as does incorporation of Fe into the structure. Particles of different shape and iron content may occur within a given sample of halloysite.en_NZ
dc.format.mimetypeapplication/pdf
dc.identifier.citationChurchman, G. J., Pasbakhsh, P., Lowe, D. J., & Theng, B. K. G. (2016). Unique but diverse: some observations on the formation, structure, and morphology of halloysite. Clay Minerals, 51(3), 395–416. http://doi.org/10.1180/claymin.2016.051.3.14en
dc.identifier.doi10.1180/claymin.2016.051.3.14en_NZ
dc.identifier.issn0009-8558en_NZ
dc.identifier.urihttps://hdl.handle.net/10289/10687
dc.language.isoen
dc.publisherMineralogical Society of Great Britain and Irelanden_NZ
dc.relation.isPartOfClay Mineralsen_NZ
dc.rightsThis is an author’s accepted version of an article published in the journal: Clay Minerals. © 2016 The Mineralogical Society
dc.subjectWateren_NZ
dc.subjectpHen_NZ
dc.subjectparticle sizeen_NZ
dc.subjectmorphologyen_NZ
dc.subjectorganic complexesen_NZ
dc.subject2-layer structureen_NZ
dc.titleUnique but diverse: some observations on the formation, structure, and morphology of halloysiteen_NZ
dc.typeJournal Article
pubs.begin-page395
pubs.elements-id142745
pubs.end-page416
pubs.issue3
pubs.notesVol. 51, Issue 3, Pagination 395-416en_NZ
pubs.organisational-group/Waikato
pubs.organisational-group/Waikato/FSEN
pubs.organisational-group/Waikato/FSEN/School of Science
pubs.volume51
uow.verification.statusverified
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