Thanks, everthing that's on there is on pretty good, I was thinking small tools like dental tools? Or have a whole lot of patience with the dremel.
I'm hoping most the rock is like the middle part, looks like it is, when I hold it under water in sunlight you can see the bubbly chalcedony with color under a lot of that ugly ryholite crusty stuff, but I won't know for sure till I remove it.