A fossilized thunderstone or meteorite, historically believed to be a stone formed by lightning striking the ground.
From Greek 'bronte' (thunder) and 'lithos' (stone). Medieval scholars used this term for unusual stones they found, thinking lightning created them, though we now know they were actually fossils or meteorites.
People in ancient times were basically doing forensic geology without knowing it—they found strange rocks and invented magical explanations because they didn't understand fossilization or space rocks yet.
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