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A few years ago, I went to a beach in the south part of Chile, specifically Lake Lanalhue, it was filled with special rocks that when you picked one up and threw it against another that you would see sparks coming from the hit. I don't know if it was flint because I am not sure if flint sparks when hitting each other. Do you have any idea of what type of stone this could have been? I also know that the Mapuche (Indians of the area) call them Rayen and use them in healing rituals.

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  • $\begingroup$ Welcome to Earth Science S.E.! If you need additional assistance, please visit The Help Center. $\endgroup$ – L.B. Mar 15 '15 at 17:43
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    $\begingroup$ Can you add a photo? $\endgroup$ – Gimelist Mar 15 '15 at 20:57
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    $\begingroup$ Yes flint sparks when hit - that is why is is sometimes called "firestone ". It occasionally has a characteristic smell. Can you describe the stones more? Color, morphology, apparent hardness, translucency... $\endgroup$ – Floris Mar 15 '15 at 20:59
  • $\begingroup$ I dont remeber much of it… but I think they were greyish white. Anyways thank you so much for the help! $\endgroup$ – Estrella Fugaz Mar 16 '15 at 19:53
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It isn't possible to give a definitive answer without further information, but the colour and the sparking are consistent with flint. We usually think about flint sparking when struck or scratched against steel but it will also spark when hit with another piece of flint.

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