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Commonly discrete, rounded [[nodular]] [[rock]] masses formed and found in [[bedding|beds]] of [[shale]] or [[clay]].
Pellant, p. 250
=Sources=
*Pellant, Chris. ''The Complete Book of Rocks and Minerals'', Dorling Kindersley Inc.: New York (1995)
[[category:geology]]
Pellant, p. 250
=Sources=
*Pellant, Chris. ''The Complete Book of Rocks and Minerals'', Dorling Kindersley Inc.: New York (1995)
[[category:geology]]