Hi all, My kids and I pick up quartz when we are traipsing around the woods and take them back for rock smashing. Some are found in the streams, some are found in dried up river beds. I crush them up fine and sift them to about 30 mesh and then run them through a homemade gold concentrator. About the only thing I've found so far is what appears to be a tiny shred of what looks to be platinum or silver that sat at the bottom of the concentrator when all the sand was gone. I was just wondering how much luck you may have had crushing quartz? Is it a mostly useless activity? If not, what do you look for before you crush?