accessory fragment

GLOSSARY OF VOLCANIC TERMS
A lithic fragment composed of country rock that has been explosively ejected during an eruption (Cas and Wright, 1987, p. 54). Accessory fragments within pyroclastic deposits may be difficult to distinguish from accidental fragments. In general terms, referred to as a xenolith.

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

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