Two unusual minerals in a nigerian soil: (I) fibrous kaolin; (II) bastnaesite
- 1 December 1977
- journal article
- Published by Mineralogical Society in Clay Minerals
- Vol. 12 (4) , 319-329
- https://doi.org/10.1180/claymin.1977.012.4.05
Abstract
A kaolin mineral in the form of long fibres, similar to the fibrous kaolin from Brazil (de Souza Santoset al., 1965), was found in the a= 7·056 andc= 9·730 Å, and was confirmed by electron diffraction from selected grains. Evidence of chemical composition was obtained by XRF and IR spectrometry. Bastnaesite can be mistaken for gibbsite because their strongest reflections have nearly the same spacing,d= 4·85 Å, when unheated oriented specimens are used. The occurrence of bastnaesite indicates that it is formed when the rock weathers, but is unstable in the soil.Keywords
This publication has 6 references indexed in Scilit:
- The kaolin mineralsPublished by Mineralogical Society ,2015
- The weathering of biotite in a profile on gneiss in MalaysiaGeoderma, 1976
- The Infrared Spectra of MineralsPublished by Mineralogical Society ,1974
- Chemical Studies of Minerals Containing Rarer Elements from the Far East. LXIII. Bastnaesite from Karasugawa, Fukushima Prefecture, JapanBulletin of the Chemical Society of Japan, 1969
- A scheme of semi-micro analysis for the major elements in clay minerals, based on modifications to conventional methods of silicate analysisClay Minerals, 1969
- Fluorite-bastnaesite deposits of the Gallinas Mountains, New Mexico, and bastnaesite paragenesisEconomic Geology, 1964