TIL Many bronze age peoples forgot what stone age tools were, and thought discovered ones as some kind of mystical talismans or signs from a thunder god ( www.theguardian.com )
Also mistaken for fulgurite by the more naturalistically minded, apparently. Maybe most common in the Nordics, based on viking references?
Additional links:
https://www.nationalgeographic.com/science/article/100810-thor-thors-hammer-viking-graves-thunderstones-science
https://fi.wikipedia.org/wiki/Ukonvaaja [Finnish]
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