All of the images I can find of Saturn’s rings are either: not close enough to show their actual composition, or ‘artist’s conception’ of what we think they might be made of.
Have none of the probes sent to study Saturn taken a close look at the rings? (I mean, close enough to see whether they are made of dust, or chunks the size of aircraft carriers?
If not, is there some technical reason why not? (risk of losing the probe in a collision, perhaps), or it it just not an interesting enough thing to want to take a close look at?