juvenile fragment

GLOSSARY OF VOLCANIC TERMS
Glassy or partially crystallized fragments which represent samples of an erupting magma. These include fragments such as pumice, scoria, reticulate, achneliths (Pele's tears, Pele's hair), and various types of volcanic bombs (Cas and Wright, 1987, p. 47-53).

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

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