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I remember reading somewhere once that someone had found the quartzite in the stones at Boscawen-Un in Cornwall to be negatively and positively charged in alternation (ie - one stone +, then the next next -, then + n' so on). Unfortunately, I have no references.

I've also heard of the Twelve Apostles giving people electric shocks, but I've never experienced it.

It's more likely to be the people who give the stones an electric shock (so to speak). If you are wearing shoes or boots that are good insulators and you get nicely charged up with static by removing a pullover or jacket and then touch a non-charged or earthed object you often get a small electric shock. I'm sure everyone has experienced something similar at some time in their lives.

If you have a sweater that crackles as you remove it, try doing it in the dark in front of a mirror.