[Rockhounds] Information Please

[B & B]

Hello Everyone: 
If someone could give me some information it would be very help full. 
I wrote a few weeks ago that I inherited some machines. I also received a box of surprised items. Some of the things I know what they are but there a approx 5 bags of what i think they called it was pumice. It almost looks like kitty litter. I am not sure if this is something for a tumbler or is it for when you cut a piece of rock you drop it in there to absorb the oil. Any information would help thanks 
Also does anybody have information on sphere machines. Does anybody know if there is a book out there. I received a small machine but no instructions thank you Betty & Robert 
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