conchoidal

About 0.07 uses per million words.

Meaning

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

Similar words

fracture brittle subconchoidal conoidal orthoconic hamiform conchitic conicoid gyroconic coniform

Often followed by

fracture to fractures or and in with fracturing breakage

Word family

conchoidally