There may be a similar attraction at Lost River Cave if I remeber correctly. But don't forget to visit Big Mike's Rock Shop. Great for kids.
That would be a separate attraction. They'd have a slough to sort the bags of material that you'd purchase. It's illegal to take anything out of the caves themselves.
Squirm, you are correct.
For that you may want to try Kentucky down under, this place isn't set up for it (not far away, they have kangaroos, but their cave is very small, muddy, and hard to navigate)
I don't think they let people mine the crystals in most caves, I may be wrong though.
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