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TeachMeFinance.com - explain Lapilli Lapilli The term 'Lapilli' as it applies to the area of volcanos can be defined as '　　 Fragments of lava or rock between 2 and 64 millimeters in size that are blasted into the air by volcanic explosions. 　　 Rock fragments between 2 and 64 mm (0.08-2.5 in) in diameter that were ejected from a volcano during an explosive eruption are called lapilli. Lapilli (singular lapillus) means 'little stones' in Italian. Lapilli may consist of many different types of tephra, including scoria, pumice, and reticulite. Rounded tephra particles in this size range are called accretionary lapilli if they consist of tiny ash grains stuck together. Ash sometimes form such rounded particles in an eruption column or cloud, owing'. Previous 5 Terms: laniary laniferous lanigerous laparoscope lapidarian Next 5 Terms: lapilliform Lapse Rate lardaceous Large Group Health Plan Large passenger car About the author Mark McCracken Author: Mark McCracken is a corporate trainer and author living in Higashi Osaka, Japan. He is the author of thousands of online articles as well as the Business English textbook, "25 Business Skills in English". Copyright © 2005-2011 by Mark McCracken, All Rights Reserved. TeachMeFinance.com is an informational website, and should not be used as a substitute for professional medical, legal or financial advice. Information presented at TeachMeFinance.com is provided on an "AS-IS" basis. Please read the disclaimer for details.