Abstract
Layer structures of regularly interstratified mica-montmorillonite (rectorite-like) were observed by high resolution electron microscopy. The specimens of regularly interstratified mineral used in this report were collected from the roseki (kaolin-pyrophyllite) deposits of Mitsuishi, Okayama Prefecture and Sano Mine, Kakuma, Nagano Prefecture.
Lattice images taken from microtomed sections which were cut perpendicularly to the cleavage plane show the periodic structures with the spacing about 10Å along the [001] direction and with the spacing about 4.0 A crossing each other at an angle of about 70°.
Lattice images of a curled edge show a periodic spacing with about 19.3Å along the [001] direction, and it is devided into two part, one of which is 10Å corresponding to a mica layer and the other is 9.3Å corresponding to a dehydrated montmorillonite layer.
The ordering in the layer stacking of the interstratified mica-montmorillonite may differ in different occurrences.
