accretionary lapilli

accretionary lapilli
GLOSSARY OF VOLCANIC TERMS
Spherical aggregates (commonly with a concentric structure) formed by the accretion of moist ash in eruption clouds (White and Houghton, 2000, p. 495). Also used for all ash aggregates, including mud lumps (Houghton et al., 2000, p. 513).

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

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