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227 bytes added ,  18:24, May 25, 2007
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Curved or shell-like [[fracture]] in many [[mineral]]s and some [[rock]]s.

Pellant, p. 250

=Sources=
*Pellant, Chris. ''The Complete Book of Rocks and Minerals'', Dorling Kindersley Inc.: New York (1995)

[[category:geology]]
nsTeam1RO, nsTeam1RW, nsTeam1_talkRO, nsTeam1_talkRW
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