Unusual X-Ray Characteristics of Vermiculite from Wiry, Lower Silesia, Poland

Boris A. Sakharov1, Elżbieta Dubińska2, Paweł Bylina3 and Grzegorz Kaproń2
1 Geological Institute, Russian Academy of Sciences, Pyzhevsky Street 7, 109017 Moscow, Russia
2 Institute of Geochemistry, Mineralogy and Petrology, Faculty of Geology, Warsaw University, al. Zwirki i Wigury 93, 02-089 Warsaw, Poland
3 Institute of Geological Sciences, Polish Academy of Sciences, ul. Twarda 51/55, 00-818 Warsaw, Poland
E-mail of corresponding author: dubinska@geo.uw.edu.pl

Abstract: Coarse-grained vermiculite from a serpentinite-pegmatite thermal zone displays a rational series of narrow 14.4 Å basal reflections and an unusual broad 28 Å peak. X-ray diffraction simulations and fitting techniques show that the 28 Å peak is related to 28 Å domains consisting of elongated 2:1 layers of different lengths. The domains are located at the crystal edges of the vermiculite.

Key Words: Crystal Edge • Interstratified Mineral • Vermiculite • XRD Characteristics

Clays and Clay Minerals; June 2001 v. 49; no. 3; p. 197-203; DOI: 10.1346/CCMN.2001.0490302
© 2001, The Clay Minerals Society
Clay Minerals Society (www.clays.org)