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== Formació==
[[File:Accretionary Lapilli - geograph.org.uk - 831917.jpg|thumb|esquerradreta|<center>Accretionary lapilli in the [[Mesoproterozoic]] [[Stac Fada Member]] of the [[Torridonian]], of probable impact origin</center>]]
Lapilli are spheroid-, teardrop-, dumbbell- or button-shaped droplets of molten or semi-molten [[lava]] ejected from a volcanic eruption that fall to earth while still at least partially molten. These granules are not accretionary, but instead the direct result of liquid rock cooling as it travels through the air.