conchoidal(redirected from conchoidally)
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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.]
1. (Geological Science) (of the fracture of minerals and rocks) having smooth shell-shaped convex and concave surfaces
2. (Geological Science) (of minerals and rocks, such as flint) having such a fracture
denoting a fracture shape whose surface resembles the inside of a clamshell, characteristic of certain minerals.