Standard textures and materials are only applied to the surface of objects.
In order to create those ribbon patterns you are talking about you would
either need to use media or use another object within the marble.  I would
suggest the latter (object in the marble) and try to create a suitable
isosurface.  That's about the extent of the help I can give for now.  I'm
sure someone else can help you with isosurfaces or whatever route you decide
to take.

-tgq

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