Fe-rich chlorites from slates from the Central Pyrenees (Spain) have been studied by high-resolution transmission electron microscopy (HRTEM) in combination with image calculations. These chlorites show various crystal imperfections, such as semirandom stacking and variations in lattice spacing. The semirandom stacking, which is common to most chlorites, is caused by shifts of magnitude b/3 parallel to the basal planes. The HRTEM images show that these shifts occur both in the 2:1 layer and at the level of the brucite interlayer. Local deviations of the (001) lattice spacing of 14-Å chlorite are caused by a local absence of the brucite interlayer (resulting in a lattice spacing of 9 Å) or by layers with a 1:1 phyllosilicate structure (lattice spacing 7 Å). The consequences of these observations for the study of deformation-induced defects in chlorite are discussed.

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