I'm new to rockhounding and all that good stuff(i have done it before though, i'm not THAT new), and i found what appears to be a good place to look. I live in california, in the foothills of Mt. Baldy, and i found that a local stream (etiwanda falls if anybody is in the area) has some shiny stones in it. Most of them are blue-green, but some are purple or silver colored. I need some info on how to find bigger chunks, techniques, recommended nearby locations, and what stones I am looking at, cause I am clueless. Oh, and if it helps, I found that by hiking another 20 minutes upstream, this is an underground stream. Actually, I'm sure that helps. Don't know why I didn't mention it earlier. Thanks in advance!