Obs. [ad. Gr. κεραυνίτης (λίθος), f. κεραυνός thunderbolt.] ‘Thunderstone’: applied by some early mineralogists to a meteorite or to meteoric iron; by others to belemnites, and to flint arrow-heads of prehistoric times viewed as ‘thunder-bolts.’
1814. T. Allan, Min. Nomencl., 10. Ceraunite (used as a synonym of meteoric iron or stone).
1822. P. Cleveland, Min., 269. Ceraunite, or thunderstone often belongs to jasper.
