I found these cool stones at a store called wonder stones. they just have neat swirls and and patterns. They are used in aquariums so I would think they are safe. They look as though they might be compressed sands layered and then fired and dried...I am TOTALLY guessing at the process. I got one that has a cool little indent that could be a natural "pool" - not big, just where water could drip w/o drenching the soil. Anyway, just wondering if anyone knows about any safety issues with this? Thanks!
lele
