I use crushed stone such as Turquoise and Malachite on some of my
turnings. The cost for already crushed stone ranges from $10 and ounce
to $20 an ounce.

I've purchased some nuggets and I was wondering how to best crush it
myself. Anyone have a simple solution?

PS I also have some blue lapis and garnet which are much harder.
Anything I use would have to be tough. The only way I've been able to
crush some of the lapis is with a sledge hammer on a rail road track but
the bag shredded.