Even a dense iron ore core can be scanned, in a very short time, to provide visual information of the core in 3D, and measure void volume, for example. This type of scan can cover 120 mm of length in 4 samples per hour at the quality shown here
Check these videos from this example on youtube:
https://www.youtube.com/watch?v=YdCZjDmz29c
https://www.youtube.com/watch?v=UxRnTzc3mrQ
Analysis performed in VGStudioMax 2.2
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