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Large quartz

I was using metal detector in backyard bc near a stream of water and it was set for gold but i ended up with large quartz and variety of quartz. Citrine, agate, white quartz ect I’m not sure why detector went off unless small amount of.gold or copper, silver but is it possible to see if anything in large stone without crumbling.it?







I have precut stones I’m going to sell but curious on these.