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Table of Contents


Vol. 9 - 2010

Vol. 8 - 2009

Vol. 7 - 2008
SP 1 - 2008

Vol. 6 - 2007
Vol. 5 - 2006
Vol. 4 - 2005
Vol. 3 - 2004
Vol. 2 - 2003
Vol. 1 - 2001-2002

Notes for Authors
(PDF - 80 kb)



GeoActa Special Publication 1 2008


Acquisto online

GeoActa
an international Journal of Earth Sciences


Elisha Shemang1, Cheo E. Suh2, Georges E. Ekosse3 and Stephanne H. Coetzee4
1Department of Geology, University of Botswana, Private Bag UB 00704, Gaborone, Botswana. 2Department of Geology and Environmental Science, University of Buea, P.O. Box 63, Buea, South West Province, Cameroon.
3Geology, Mining and Minerals Programme, University of Limpopo,Private Bag X1106,Sovenga 0727, South Africa
3Electron Microscopy Unit, University of Botswana, Private Bag UB 00704, Gaborone, Botswana

E-mail: shemae@mopipi.ub.bw, eshemang@yahoo.co.uk


Crystal morphology and indicative microchemistry of kaolinite from kaolin occurrences in Alkaleri region, northeastern Nigeria


Volume 6, 2007, pages 25-36

PDF (1.3 Mb)
Abstract

Samples from eight kaolin occurrences in and around the Alkaleri area, northeastern Nigeria, were studied for their mineral constituents (by X-ray diffractometry, XRD), kaolinite morphology and microchemistry (by combined scanning electron microscopy, SEM, and transmission electron microscopy, TEM equipped with an energy dispersive spectrometer, EDS). The kaolins are very fine-grained and light grey to white in colour. In terms of mineral constituents, all the kaolin occurrences are abundantly rich in kaolinite, with four of them being monomineralic. Minor to trace quantities of quartz, illite, muscovite and hematite are present in the other four occurrences. The kaolinite crystals are preponderantly pseudo hexagonal in morphology making them suitable for use in industrial applications in which coating is required. The kaolins are derived from the weathering of the feldspar-bearing sandstones. 

Keywords: Kaolinite, Kaolin, TEM, XRPD, SEM, Nigeria