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 (pī′sə-lĭth′, -zə-, pĭs′ə-, pĭz′ə-)
A small, rounded, concentric accretion of rock, usually of calcium carbonate, larger and less regular than an oolite. Also called pisolite.

[Greek pisos, pea + -lith.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Geological Science) geology any of the pea-sized concentric formations within a fine matrix that form a pisolite
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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For instance, the international literature records terms such as laterite, petroferric contact, ferricrete, cuirasse, duricrusts, iron crusts, ironstones, ironpans, pisoliths, pisoplinthite, iron concretions and nodules.
The Goulburn Bauxite Project deposits typically have an upper half that contains nodules or "pisoliths" of a black, glassy material which is an emery, comprising mainly fused alumina and trace iron oxides.
FTIR-RM mapping has been used to determine the distribution of the different chemical components in human gallstones [13], to characterize the minerals in pisoliths [14], the mineral and collagen in tooth dentin [15] and the mineral and resins in dental composites [16].