Editing Lapilli (section)

{{Short description|Small pyroclast debris thrown in the air by a volcanic eruption}}
[[File:PuuPuaiLapilli large.jpg|thumb|right|340px|Lapilli on [[Kilauea]]]]

'''Lapilli''' ({{singular}}: '''lapillus''') is a size classification of [[tephra]], which is material that falls out of the air during a [[volcano|volcanic eruption]] or during some [[meteorite impact]]s.<ref name="Bron">{{cite book|last=Bron|first=K.A.|editor=Reimold W.U. & Gibson R.L.|title=Large Meteorite Impacts and Planetary Evolution IV|chapter-url=https://books.google.com/books?id=YB6Xw6rYwksC&q=accretionary+lapilli+meteorite+impact+events&pg=PA222|access-date=22 May 2011|series=Special Paper|volume=465|year=2010|publisher=The Geological Society of America|isbn=978-0-8137-2465-2|page=222|chapter=Accretionary and melt impactoclasts from the Tookoonooka impact event, Australia}}</ref> ''Lapilli'' is Latin for "little stones".

By definition lapilli range from {{convert|2|to|64|mm|in|2|abbr=on}} in diameter.<ref>{{cite journal|last1=Fisher|first1= R. V.|date=1961|title= Proposed classification of volcaniclastic sediments and rocks|doi=10.1130/0016-7606(1961)72[1409:PCOVSA]2.0.CO;2|journal=Geological Society of America Bulletin|volume= 72|issue=9|pages= 1409–1414|bibcode=1961GSAB...72.1409F}}</ref> A [[Pyroclastic rock|pyroclastic]] particle greater than 64&nbsp;mm in diameter is known as a [[volcanic bomb]] when molten, or a volcanic block when solid.  Pyroclastic material with particles less than 2&nbsp;mm in diameter is referred to as [[volcanic ash]].<ref>[http://volcanoes.usgs.gov/images/pglossary/lapilli.php VHP Photo Glossary: Laplli] in USGS Photo Glossary of volcano terms]</ref><ref>[http://www.geology.sdsu.edu/how_volcanoes_work/Tephra.html How Volcanoes Work]</ref>