In 1994 a car and its driver were struck by a 1417 g stone on km 17 of the Andalusia highway near Getafe in Southern Madrid. Eighty one additional fragments of the same material were later recovered. The possible extraterrestial origin of this stone has been discussed in the literature (e.g. Martinez-Frias et al., 1999). Extensive data have now been acquired on these objects. The fall trajectory (20 degrees), the petrology, geochemistry, oxygen isotope composition, ¹⁴C content and the distribution of similar rocks along nearby roads strongly suggests they have a terrestrial origin. The rock is most likely an artifical steel slag from the Aristrain scrap smelting factory. For more information about this rock see http://tierra.rediris.es/merge/getafe.html

Reference: Martinez-Frias, J., Weigel A., Marti K., Boyd T., Wilson G. H., and Jull T. The Getafe rock: Fall, composition and cosmic ray records of an unusual ultrarefractory scoriaceous material. (1999) Rev. Metal. Madrid 35 308-314.