Transformation of Sericite into an Interstratified Mineral

Katsutoshi Tomita and Toshio Sudo
Institute of Earth Sciences, Kagoshima University, Kagoshima, Japan
Geological and Mineralogical Institute, Faculty of Science, Tokyo University of Education, Tokyo, Japan

Abstract: Sericite was K-depleted with molten LiNO3. The sample was changed into an interstratified structure in the presence of a small amount of LiNO3 after prolonged treatment, and in the presence of a considerable amount of LiNO3 a similar structure was formed after about 3 hr of reaction. In the case of the presence of the proper amount of NaCl, a mixed-layer structure was easily obtained by treatment for a long period of time with a considerable amount of molten LiNO3.

The interstratified mineral had a basal spacing of 22 Å–23·3 Å which was expanded to 25 Å–27·6 Å by treatment with ethylene glycol.

Clays and Clay Minerals; September 1971 v. 19; no. 4; p. 263-270; DOI: 10.1346/CCMN.1971.0190407
© 1971, The Clay Minerals Society
Clay Minerals Society (www.clays.org)