> That probably does not create what i would call a crack - a surface inside
the
> sphere where light is reflected and refracted.

Yeah, I realize it's kind of 'cheating', but even in this case, the light
should be reflecting and refracting in the 'crack' created by the marble
inside the object since it's transparent.  So it would still give the
illusion of a crack.

> I would suggest two intersections between a sphere and an isosurface (the
second
> with sign -1) that are put together.

Hmm... I'll give that a try.

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