agglomerate

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agglomerate

a rock consisting of angular fragments of volcanic lava
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

agglomerate

[ə′gläm·ə·rət]
(geology)
A pyroclastic rock composed of angular rock fragments in a matrix of volcanic ash; typically occurs in volcanic vents.
(metallurgy)
A rigid mass of metallic particles that have been joined together by a powder metallurgical technique, such as sintering.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.