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LAPILLI (pi. of Ital. lapillo, from Lat. lapillus, dim. of lapis, a stone), a name applied to small fragments of lava ejected from a volcano. They are generally subangular in shape and vesicular in structure, varying in size from a pea to a walnut. In the Neapolitan dialect the word becomes rapilli a form sometimes used by English writers on volcanoes. (See VOLCANOES.)

Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)

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