Table 1.

Results of the X-ray CT analyses of potential iron sulphide content in the Luarca slate and comparison with results of optical microscopy

SampleVoxel resolution (µm)X-ray CT analysis of thin surface slice (thickness of 27 µm comparable with the surface of polished section) (%)X-ray CT analysis of the whole sample volume (%)Polished sections using reflected light (%)
Ac. 200.310.670.44
B0.310.340.36
C0.210.350.33