Once having worked in a gold mine, "in the black mining hills of south dakota" (a line from the Beatles "Rocky Racoon") I found the ore would often "follow me home" Seemed it would hide in my lunchbox. It became lost in time, after once attempting to grind some of it in an old second hand rock tumbler, with thoughts of possibly having a ring made with it. That only made a mess, and the rest got shelved. I've recently began wondering if it should be unshelved, and found this forum in a quest for information. Thanks for being here GRF!