conchoidal

Dictionary: con·choi·dal (kŏng-koid'l) pronunciation

adj.
Of, relating to, or being a surface characterized by smooth, shell-like convexities and concavities, as on fractured obsidian.

[From Greek konkhoeidēs, mussellike : konkho-, concho- + -oeidēs, -oid.]

conchoidally con·choi'dal·ly adv.

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Describing the smoothly curved, glasslike (literally, shell-like) character of a fracture (broken surface) common to many minerals.

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		Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved. Read more
		Geological Glossary. Peterson Field Guide to Rocks and Minerals, by Frederick H. Pough. Copyright © 1998 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved. Read more