Dave, Dahtzu posted this on another thread for you!
"Help! somewhere I read that Dave was going to make stepping stones, and this message is for him. Today I went to a granet cutting place and asked for scrap granet. Was told I could get as much as I wanted anytime I want to get it. I immediately thought of you Dave wondering if you might use small pieces of granet with your mix? Just trying to help. Anyway, it's worth a try. I got many different size pieces and was told they will save larger pieces as they get them. I like smaller pieces as a path through the garden and use the larger pieces to place garden art on."