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In the past years X-ray computed tomography (CT) has became more and morecommon for geoscientific applications and is used from the µm-scale(e.g. for investigations of microfossils or pore-scale structures) up tothe dm-scale (full drill cores or soil columns). In this paper we presentresults from CT imaging and mineralogical investigations of an Opalinus Claycore on different scales and different regions of interest, emphasizingespecially  the 3-D evaluation and distribution of cracks and theirimpact on mechanical testing of such material. Enhanced knowledge of thetesting behaviour of the Opalinus Clay is of great interest, especially sincethis material is considered for a long-term radioactive waste disposal andstorage facility in Switzerland. Hence, results are compared regarding themineral (i.e. phase) contrast resolution, the spatial resolution, and theoverall scanning speed.  With this extensive interdisciplinary scale-down approach it has beenpossible to characterize the general fracture propagation in comparison tomineralogical and textural features of the Opalinus Clay. Additionally, andas far as we know, a so-called mylonitic zone, located at an intersect oftwo main fractures, has been observed for the first time for anexperimentally deformed Opalinus sample. The multi-scale results are in goodaccordance to data from naturally deformed Opalinus Clay samples, whichenables us to perform systematical research under controlled laboratoryconditions. Accompanying 3-D imaging greatly enhances the capability of datainterpretation and assessment of such a material

X-ray computed tomography investigation of structures in Opalinus Clay from large-scale to small-scale after mechanical testing