conchoidal

/K AA1 N CH OY1 D AH0 L/

adjective

1
Of or pertaining to a conchoid; that may be defined as a conchoid.
2
(of a fracture) Irregular, with planar, concentric curves, similar to those on a mussel shell.
3
(of a mineral) That fractures with planar concentric curves (e.g., as flint, chert or obsidian).

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