Abstract
The metal atoms in a sample of zinkenite from Wolfsberg, Germany, have been imaged directly by high-resolution transmission electron microscopy (HREM). The [001] image shows that the tunnel cation sites on the sixfold screw axes are at least partially occupied; previous studies have given conflicting results concerning the occupancy of these sites. Dark-field electron micrographs and [010] high-resolution images show that zinkenite has a domain structure; the average hexagonal structure consists of ordered domains with orthorhombic lattice geometry. The domains are in three orientations and have a rodlike morphology extending parallel to c.
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