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出典:Wiktionary
lapilli
lapillī
出典:Wikipedia
出典:『Wikipedia』 (2011/05/22 12:22 UTC 版)
Lapilli is a size classification term for tephra, which is material that falls out of the air during a volcanic eruption or during some meteorite impacts. Lapilli (singular: lapillus) means "little stones" in Latin. They are in some senses similar to ooids or pisoids in calcareous sediments.