Definitions from Wiktionary (conchoidal)

▸ adjective:  (mathematics) Of or pertaining to a conchoid; that may be defined as a conchoid.
▸ adjective:  (mineralogy, of a fracture) Irregular, with planar, concentric curves, similar to those on a mussel shell.
▸ adjective:  (mineralogy, of a mineral) That fractures with planar concentric curves (e.g., as flint, chert or obsidian).





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