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Electrically conductive rocks.
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Previously:
https://www.homemadetools.net/forum/...824#post194302
https://www.homemadetools.net/forum/...436#post222534
https://www.homemadetools.net/forum/...797#post140228
Some details would be nice!!
Iron ore perhaps. Those rocks contain sufficient iron to be magnetic. I have a spare key held under my 4WD with a magnetic & whenever I'm camping in an iron ore area the dust collects over the magnet inches deep. So much so it's a real nuisance.
https://www.youtube.com/watch?v=atct1zueo-I
A video to debunk the first video.
I can see an iron bar under the rock. I'm guessing there is a welder hooked up and they are just showing that there is electrical continuity through the high iron content in the rock.