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TEM and SFM of exsolution and twinning in an alkali feldspar

¹ Department of Earth and Planetary Sciences, The University of New Mexico, Albuquerque, New Mexico 87131-1116, U.S.A.
² Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, Maryland 21218, U.S.A.
³ Department of Chemistry/Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, U.S.A.

Correspondence: ^* e-mail: hfxu{at}unm.edu

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.

This article has been cited by other articles:

				M. R. Lee, D. J. Brown, C. L. Smith, M. E. Hodson, M. MacKenzie, and R. Hellmann Characterization of mineral surfaces using FIB and TEM: A case study of naturally weathered alkali feldspars American Mineralogist, August 1, 2007; 92(8-9): 1383 - 1394. [Abstract] [Full Text] [PDF]