Quartz crystal in my vicinity?

[dr00bie]

Does anyone know of any pretty solid places to look for decent quartz crystal (clear, smoky) in my vicinity? I live in Wytheville, VA. Or, could anyone give me any pointers to find out where they could be? I know where there a good many, but the landowner won't allow permission because his wife likes to collect them. And another place is the elementry school recess area, which has a massive maple tree and a pretty good sized spruce tree which we used to find small crystals. I guess what I'm asking is, is there any way to tell where crystals would be? Or is that impossible?

Thanks,
Drew