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Related to autolith: xenolithic
A fragment of igneous rock enclosed in another igneous rock of later consolidation, each being regarded as a derivative from a common parent magma.
A round, oval, or elongated accumulation of iron-magnesium minerals of uncertain origin in granitoid rock.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.