Identification of Kaolin Minerals in the Presence of Chlorite by X-Ray Diffraction and Infrared Absorption Spectra
Experimental data are presented to show that the current auxilliary procedures adopted for identification of kaolinite in the presence of chlorite are not generally valid because the procedures often fail to give an explicit condition for distinguishing both the minerals.
As the result of an examination of numerous infrared spectra in the OH region of clay minerals, obtained by using Nippon Bunko DS-401G Grating Speetrophotometer, it turned out that the absorption band at 3698±2 cm−1 is effective for distinguishing kaolinite from other clay minerals without the use of any additional techniques. The absorption band seems to be less affected by variation of particle size and crystallinity than is the X-ray diffraction pattern. The band is detectable to a few weight percent of kaolinite in total amounts of clay minerals. Identification of kaolinite by its absorption spectrum in clay samples from sedimentary rocks was successful.
Unable to display preview. Download preview PDF.
- Brindley, G. W. (1961) Kaolin, serpentine, and kindred minerals, and chlorite minerals: in The X-ray Identification and Crystal Structures of Clay Minerals, 2nd Edition, G. Brown, ed. Mineralogical Soc., London, p.84, and pp.260–266.Google Scholar
- Kobayashi, K., and Oinuma, K. (1961) Clay mineral composition of the core sample obtained from the bottom of the Japan Trench by Takuyo in 1959: Contribution from the Marine Research Laboratory. Hydrographic Office of Japan, v.2, pp. 109–117.Google Scholar
- Nelson, B. W., and Roy. R. (1954) New data on the composition and identification of chlorites: in Clays and Clay Minerals, Natl. Acad. Sci.-Natl. Res. Council, pub. 327, pp.335–348.Google Scholar
- Oinuma, K., and Kodama, H. (1962) Infra-Red absorption spectra of clay minerals: (in Japanese with English abstract). In press. J. Oeol. Soc. Japan.Google Scholar