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plural thunderstones
(archaic) A thunderbolt.
A stone or fossil thought to be, or be caused by, a thunderbolt striking the earth. quotations examples
Thunderstones are sacred to the vodounist, forged as they are by Sobo and Shango, the spirits of thunder and lightning.
1985, Wade Davis, The Serpent and the Rainbow, Simon & Schuster, page 94
A belemnite. examples