A textural term for fragments in volcanic rocks and volcanic deposits that range from 2mm to 64mm in diameter (Fisher, 1966; Schmid, 1981).
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.
These lapilli were erupted from the Kilauea Iki Crater in 1959 and landed about 800 m downwind.
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 to moisture or electrostatic forces.

Glossary of volcanic terms. - University of Wisconsin Oshkosh. . 2001.

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  • Lapilli — is a size classification term for tephra, which is material that falls out of the air during a volcanic eruption. Lapilli (singular: lapillus) means little stones in Latin. They are in some senses similar to ooids or pisoids in calcareous… …   Wikipedia

  • Lapilli — des Puu Puai, eine aus eruptiertem Material des Kilauea bestehende Erhebung Unter Lapilli (ital. „Steinchen“) werden in der Vulkanologie erbsen bis nussgroße (2–64 mm große) Pyroklasten bezeichnet, die bei einem explosiven Vulkanausbruch… …   Deutsch Wikipedia

  • Lapilli — sur le Kilauea. Lapilli sur l …   Wikipédia en Français

  • lapilli — [ lapi(l)li ] n. m. pl. VAR. lapillis • 1756; mot it., plur. de lapillo, lat. lapillus, dimin. de lapis « pierre » ♦ Géol. Petites pierres poreuses projetées par les volcans en éruption. Couche meuble de lapilli. ⇒ pouzzolane. ● lapilli nom… …   Encyclopédie Universelle

  • Lapilli — La*pil li, n. pl. [L. lapillus a little stone, dim. of lapis stone.] (Min.) Volcanic ashes, consisting of small, angular, stony fragments or particles. [1913 Webster] …   The Collaborative International Dictionary of English

  • Lapilli — (Rapilli), kleine Steine, welche aus den Vulkanen mit Asche u. Schlacken ausgeworfen u. oft über weite Strecken fortgeschleudert werden …   Pierer's Universal-Lexikon

  • Lapilli — (lat., »Steinchen«, fälschlich Rapilli), Lavastückchen, die, von Vulkanen ausgeschleudert, die Aufschüttungskegel bilden. Vgl. Vulkan und Sand …   Meyers Großes Konversations-Lexikon

  • Lapilli — (Rapilli), s. Auswürflinge, vulkanische …   Lexikon der gesamten Technik

  • Lapilli — (lat. und ital.; dialektisch auch Rapilli) kleine von den Vulkanen ausgeworfene Schlackenstücke …   Kleines Konversations-Lexikon

  • lapilli — sustantivo masculino 1. Área: geología Conjunto de productos expulsados por un volcán en erupción …   Diccionario Salamanca de la Lengua Española

  • Lapilli — Depósito de lapilli en el volcán Kilauea. El lapilli (singular lapillus, del latín: «pequeñas piedras») es un término de clasificación de la tefra según su tamaño y está constituido por fragmentos piroclásticos, expulsados por un volcán durante… …   Wikipedia Español

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