 | | Journal (article/letter/editorial) | | Minerals in a Single Keokuk Geode from the Lower Warsaw Formation, Hamilton, Illinois, USA Nova Mahaffey *...University of Texas at Dallas, Richardson, TX 75093, USA; bobf@utdallas.edu * Correspondence: novamahaffey5@gmail...extensive optical and chemical analysis of a single Keokuk geode using electron microscopy (SEM) with energy...further investigation into the micro-minerology of Keokuk geodes. Our SEM/EDX analysis reveals an array of...millions of years. Complexity of Minerals in a Single Keokuk Geode from the Lower Warsaw Formation, Hamilton |  | | Journal (article/letter/editorial) | | Postcard view of the Waukon iron mine, Allamakee County, cia. 1912. John Taylor collection. ARTHUR E ...HAROLD L. PRlOR P.O. Box 111 Columbus Junction, Iowa 52738 halprior@ louisacomm.net When we began this...too, could be cited with many other localities. Iowa contains the type locality for one mineral, iowaite...December 2014 Figure 2. Map of Iowa showing the counties. Courtesy Iowa Geological Survey. ACKNOWLEDGMENTS...is courtesy of the Iowa Geological Survey. Localities by County Allamakee County Lansing, Lansing lead |  | T. Johnston, Cliff, Elzea Kogel, Jessica, L. Bish, David, Kogure, Toshihiro, H. Murray, Haydn (2008) Low-temperature Ftir Study of Kaolin-Group Minerals. Clays and Clay Minerals, 56 (4) 470-485 doi:10.1346/ccmn.2008.0560408 | Journal (article/letter/editorial) | | West Lafayette, IN 47907-2054, USA 2 IMERYS, Sandersville, GA 31082, USA 3 Department of Geological Sciences...Sciences, Indiana University, Bloomington, IN 47405, USA 4 Department of Earth and Planetary Science, Graduate...low-temperature positions of the n(OH) bands of kaolinite, dickite, and nacrite were linearly correlated...disorder was found in high Hinckley-Index kaolinite from Keokuk, Iowa, and from Cornwall, England. Dickite-...observed in both high- and low-Hinckley-index kaolinite and the amounts of these stacking sequences generally |  | | Journal (article/letter/editorial) | | No. 2, 73–84, 2015. MID-INFRARED FEATURES OF KAOLINITE-DICKITE J AV I E R C U A DR O S * , R A QU E L...London SW7 5BD, UK Abstract—Transformation of kaolinite to dickite is a common diagenetic reaction. The...quantification of the relative proportions of kaolinite and dickite, validated by X-ray diffraction (XRD)...during the mineralogical changes. A group of kaolinite and dickite samples was investigated: 13 samples...Sea), three kaolinite specimens with different crystal order and particle size (KGa-2, kaolinite API 17, |  | | Journal (article/letter/editorial) | | Vol. 34, No. 6, 68 9~9 1 , 1986. WELL-ORDERED KAOLINITE IN SIDERITE CONCRETIONS FROM THE BRAZIL FORMATION...Words-Concretion, Crystallinity, Kaolinite, Ordering, Siderite. Soft, white kaolinite fills many shrinkage cracks...the Keokuk, Iowa, kaolinite that is found in geodes (Keller et al., 1966). The Keokuk kaolinite is one...mined in open pits south of the town of Brazil, Gay County, Indiana. Dark gray to red siderite concretions...cracks as wide as 8-9 mm which are filled with kaolinite, Sphalerite crystals are locally present in the |  | | Journal (article/letter/editorial) | | STRATA OF SOUTHEAST IOWA by JOHN B. HAYES University of Iowa, Iowa City, Iowa ABSTRACT Clay mineral...from the marine Keokuk, Warsaw and Salem formations of Mississippian age from southeast Iowa and nearby portions...absent or rare in Keokuk rocks, but is increasingly abundant upward in the section. Kaolinite is confined to...prevails, but the first appearances of chlorite and kaolinite are shifted downward in the stratigraphic section...to that found by investigators in other areas: kaolinite confined near shore, chlorite in an intermediate |  | Shoval, S., Yariv, S., Michaelian, K. H., Boudeulle, M., Panczer, G. (1999) Hydroxyl-stretching bands ‘A’ and ‘Z’ in Raman and infrared spectra of kaolinites. Clay Minerals, 34 (4) 551-563 doi:10.1180/000985599546442 | Journal (article/letter/editorial) | | last four decades. According to Bish (1993) the kaolinite unit-cell contains four different OH groups. This...IR spectra of partially deuterated synthetic kaolinite, and also attributed it to uncoupled inner-surface...inner-surface OH-stretching. Deuteration of a natural kaolinite (Michaelian et al., 1987) led to similar conclusions...detected at similar frequencies in IR spectra of kaolinite/alkali halide complexes (Yariv, 1986; Michaelian...Indeed, it is considerably more intense for Keokuk kaolinite than for Mesa Alta kaolinites; moreover, its |  | Shoval, S., Yariv, S., Michaelian, K. H., Boudeulle, M., Panczer, G. (2002) Hydroxyl-stretching Bands in Polarized Micro-raman Spectra of Oriented Single-Crystal Keokuk Kaolinite. Clays and Clay Minerals, 50 (1) 56-62 doi:10.1346/000986002761002676 | Journal (article/letter/editorial) | | MICRO-RAMAN SPECTRA OF ORIENTED SINGLE-CRYSTAL KEOKUK KAOLINITE S. S HO VAL 1 , *, S. Y AR I V 2 , K . H ...micro-Raman spectra of a single large crystal of Keokuk kaolinite were recorded in the OH-stretching region...Spectra, Kaolinite, Raman Spectra, SEM Micrographs. uted to the crystal size of the kaolinite observed...observed in SEM images. The crystal size of the kaolinite in the altered phenocryst is limited to 1 mm and that...crystal size and the degree of crystallinity of the kaolinite (Shoval et al., 1999a,b). The intensity and area |  | | Journal (article/letter/editorial) | | REFINEMENT OF NON-HYDROGEN ATOMIC POSITIONS IN KAOLINITE D. L. R. B. BISH L AND VON DREELEz , Earth...Abstract-Thestructure ofkaolinite (non-hydrogen atoms only) from Keokuk, lowa, was refined in space group Cl using CuKa...characteristic of previous Rietveld refinements of kaolinite. All Keokuk sam pIes examined contain small amounts...to those refined for kaolinite. Results indicate that the individual kaolinite layer is very similar...therefore be reevaluated, especially regarding the kaolinite space group and hydrogen positions. Existing X-ray |  | | Journal (article/letter/editorial) | | hydrogen bonding is weaker in dickite than in kaolinite; (2) frequency of the vl stretching band of the...hydroxyls increases sequentially from well-ordered kaolinite through the disordered structures to well-ordered...not compatible with the crystal structures of kaolinite and dickite as refined by Suitch and Young. Key...Fourier-transform inflared spectroscopy, Kaolinite. INTRODUCTION Kaolinite and dickite are dioctahedral 1:1...1:1 layer silicates. The structure of kaolinite has been studied by Brindley and Robinson (1946), Brindley |  | | Journal (article/letter/editorial) | | of (1) kaolinite and dickite which crystallized from solution within cavities, (2) kaolinite weathered...silicate material, (3) residual kaolinite from primary silicate rock, (4)kaolinite above and below a basal unconformity...granitic rock, and (5) hydrothermally altered kaolinite. The texture of kaolin reflects the environment...environment produces large crystal flakes of kaolinite, expanded books, mats of elongates, high porosity...they were generated. KAOLINITE CRYSTALLIZED IN CAVITIES WITHIN OTHER ROCKS Kaolinite, dickite, and nacrite |  | | Journal (article/letter/editorial) | | Mineralogist, Volume 99, pages 681–695, 2014 Kaolinite transformation into dickite during burial diagenesis...28040 Madrid, Spain 2 Abstract The mechanism of kaolinite transformation into dickite has been investigating...Sea), 3 kaolinite specimens with different crystal order (KGa-2, Kaolinite API 17, Keokuk kaolinite), and...increase of the crystal order of kaolinite; (2) in dickite-rich specimens kaolinite and dickite have crystals...correlation between particle dimensions and relative kaolinite-dickite content. These results are interpreted |  | | Journal (article/letter/editorial) | | (NIR) reflectance spectra for mixtures of ordered kaolinite and ordered dickite have been found to simulate...disordered kaolinite. The amount of octahedral vacancy disorder in nine disordered kaolinite samples was...calculated X-ray diffraction patterns. The ordered kaolinite and dickite samples used in the reference mixtures...also recorded for laboratory mixtures of ordered kaolinite and halloysite to assess whether the spectra could...physical mixtures of these two clays. Although the kaolinite-halloysite proportions could only be roughly estimated |  | | Journal (article/letter/editorial) | | Press. Printed in Great Britain DICKITE A N D KAOLINITE IN P E N N S Y L V A N I A N LIMESTONES OF S O...University of Iowa, Iowa City, Iowa 52240 (Received 6June 1967) Abstract-- Dickite and kaolinite are polymorphs...on field and laboratory evidence. Dickite and kaolinite occur in cavities in phylloid algal limestones...development are genetically significant. Dickite-kaolinite distribution is related to: (1) stratigraphic...associated preferentially with porous algal mounds. Kaolinite occurs in less porous rocks within the dickite |  | | Journal (article/letter/editorial) | | Sphalerite and calcite, 5 cm across, Denton mine, Hardin County. Ross Lillie specimen. +!.+!+%% 34!2+ +./8 ...chalcopyrite, and sphalerite, 12.7 cm high, Hardin County. Marv Rausch specimen. 3(%,"9 -!#/50). /5 ....and barite, 6 cm high, Minerva No. 1 mine, Hardin County. Ross Lillie specimen. Figure 5 (above right).... Barite, 12.9 cm across, Denton mine, Hardin County. Ross Lillie specimen. Figure 6 (right). Fluorite...Fluorite, 1.9 cm on edge, Minerva No. 1 mine, Hardin County. Harris Precht specimen, Terry Huizing photo. Arthur |  | | Journal (article/letter/editorial) | | Analogous to the apparent crystallinity of a "kaolinite" being the product of a mixture, so may other...other widely ranging properties of "kaolinite" be products of kaolin-mineral mixtures in microdimensions ...for a monomineraIic, nearly ideal kaolinite are considered-the Keokuk geode variety possesses desired crystaUographic...Words-Crystallinity, Halloysite, Kaolin, Kaolinite . INTRODUCTION Ideal kaolinite can be specifically defined in...numerical data on the fundamental properties of "kaolinite" vary so widely that their limits are circumscribed |  | | Journal (article/letter/editorial) | | in part of the Corninclude well-crystallized kaolinite, and varieties of ka- wall, England, kaolins....Keller ly interlocked and intergrown crystals of kaolinite as in flint clay. In other words, kaolin may have...Included are kaolinites within quartz geodes in the Keokuk, Iowa, locality (Keller et al., 1966; Hayes, 1963);...limestone near Shelbina, Missouri (Keller, 1970); kaolinite and dickite in a Pennsylvanian-age limestone in...belt. Probably many of the authigenic-diagenetic kaolinite or dickite crystals present in pores of sands |  | | Journal (article/letter/editorial) | | Figure 2. Keokuk geode (7 inches in longest dimension) from Mississippian strata in southeastern Iowa. The...(This photograph,used as the cover illustration on Iowa Geology [1994], was supplied by B. F. Glenister...courtesy Patricia Lohmann, the artist who designs the Iowa Geological Survey bulletins; photograph by Tim Kemmis)...Minerals recorded from geodes of the three-state Keokuk area. Minerals whose names have no symbol after...were collected by the author and his wife in Lee County, Iowa, in 1947, plus observations of definitive |  | | Journal (article/letter/editorial) | | pools on the floor. aFisher.F. SOMEOCCURRENCES OF KAOLINITE DEPOSITEDFROM SOLUTION W. A. Tenn AND W. D. Knr...study of dickite in Missouri,l the authors found kaolinite in several localities in which its occurrence...Reavis barite mines near Henley, Missouri;and Keokuk, Iowa. Oronogo is in southwestern Missouri; the Henley...locality is in central Missouri; and Keokuk is just across the Missouri-Iowa line at the northeastern corner...corner of the state of Missouri. The kaolinite in all these localities is pure white, and occurs in very small |  | | Journal (article/letter/editorial) | | 47, No.4, 487-494, 1999. REFINEMENT OF THE KAOLINITE STRUCTURE FROM SINGLE-CRYSTAL SYNCHROTRON DATA...crystal structure of single crystals of kaolinite from Keokuk, Iowa, was refined using data measured at the...Words-Crystal Structure, Diffuse Scattering, H-Positions, Kaolinite, Microcrystal, Single Crystal Refinement, Synchrotron...Radiation. INTRODUCTION Kaolinite crystals from geodes found near Keokuk, Iowa, are often of exceptional...this indicates a lack of stacking faults. Kaolinite from Keokuk was a focus of several studies with conflicting |  | | Journal (article/letter/editorial) | | location a~ included at the end of each entry. Adair County Chariton River (40-04-05N 92-4 I -23W). septarian...septarian concretions about 2 miles north of the Macon county line. CALCITE crystals enclosing bundles of acicular...hematite, quartz (Broadhead 1873b, 1877). Audrain County Mexico, in fire clay pits and spoil piles: PYRITE...University Library] at 19:58 29 October 2014 Barton County McKarrow’s coal bank (37-37N 94-28W), 2.5 miles...PICKERINGITE, pyrite, siderite (Broadhead 1873b). Bates County Panther Creek, northwest of Rockville in coal deposits: |  | | Journal (article/letter/editorial) | | disorderedkaolinites.The structuralrelationsof dickite and kaolinite and the probablenature of the disordersare reviewed...resemblingdickite at Job'sHill, St. Mary, and kaolinite. Subsequentfield observationsby one Jamaicawas...possiblybe unique.X- While disorderedforms of kaolinite have been deray diffraction patterns indicatedthat...times,few accountsof disordereddickbelongedto the kaolinite group, but the high degree ites have appeared...buried nor extensively altered hydronacriteand kaolinite." thermally." A sampleof the Job's Hill materialgivento |  | | Journal (article/letter/editorial) | | LETTER Morphological characteristics of ordered kaolinite: Investigation using electron back-scattered diffraction...ABSTRACT Morphology of kaolinite crystals with high-crystallinity (Keokuk, Iowa) has been investigated...generally correspond to those expected from ordered kaolinite. Elongated hexagonal crystals always show the...interlayer shift) of the Keokuk kaolinite. Inversely, the crystallinity of individual kaolinite grains may be evaluated...feasibility to discriminate the enantiomers in kaolinite using EBSD is also described. INTRODUCTION Morphological |  | | Journal (article/letter/editorial) | | Minerals. Vol. 36. No.2. 153-158, 1988. AUTHIGENIC KAOLINITE AND DICKITE ASSOCIATED WITH METAL SULFIDES-PROBABLE...65211 Abstract-Authigenic, well-crystallized kaolinite and dickite occur within sulfide mineral deposits...Mississippi Valley type in Arkansas, Kansas, Missouri, Iowa, Wisconsin, Illinois, and Indiana. Fluid inclusions...the mid-continent region. Key Words-Dickite, Kaolinite, Metallic ores, Morphology, Regional thermal event... INTRODUCTION Authigenic, well-crystallized kaolinite and dickite have been observed in paragenetic |  | | Report (issue) | | I s { IOWA ft 7 ■■• A * i . ;» \ P* A 7-. ■ «*"V ' r * < •+ ' 1 ’ T, / • k’-/ 5...i S' s I . " * • * «r- ‘ ; ' Geologist, Iowa Geological Survey ' .*4** =»*' I Paul*J. Horick...Jithill * v'v* l* Iowa Geolo^ica^Survey Educational Series 2 V . - -■' ( J Iowa Geological Survey...Educational Series 2 THE MINERALS OF IOWA by Paul J. Horick Geologist Iowa Geological Survey edited by Otto...STATE OF IOWA 1974 Library of Congress Catalog Card Number: 74-620075 Available from the Iowa Geological |
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