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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.]

con·choi′dal·ly adv.


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
conˈchoidally adv


(kɒŋˈkɔɪd l)

denoting a fracture shape whose surface resembles the inside of a clamshell, characteristic of certain minerals.
con•choi′dal•ly, adv.
References in periodicals archive ?
In outcrop, the shale appears to be homogeneous massive claystone; it breaks conchoidally and displays no obvious bedding.
True, their silhouettes somewhat resembled the specific types listed, but they did not get into their shapes by being conchoidally flaked.
Instead they are generally much harder and more homogeneous raw material; they flake conchoidally and are able to withstand larger amounts of force.