Huifang Xu, David R. Veblen, Peter Buseck, B.L. Ramakrishna; TEM and SFM of exsolution and twinning in an alkali feldspar. American Mineralogist ; 85 (3-4): 509–513. doi: https://doi.org/10.2138/am-2000-0412
Download citation file:
Transmission electron microscopy (TEM) reveals exsolution lamellae in a cryptoperthite; their spacing results in a greenish-yellow iridescent color. High-resolution TEM images show that the boundaries between Ab-rich and Or-rich lamellae are semi-coherent along the b axis.
Scanning force microscopy (SFM) of a (001) cleavage surface reveals exsolution lamellae, wave-like (001) surfaces of the Ab-rich lamellae, and surface steps with heights of ~6.6 and ~3 Å. The wave-like (001) surfaces of albite twin lamellae may result from surface relaxation. Surface height differences between Ab- and Or-rich lamellae in some areas indicate a semi-coherent boundary along the c axis.