conchoidal

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conchoidal

[käŋ′kȯid·əl]
(geology)
Having a smoothly curved surface; used especially to describe the fracture surface of a mineral or rock.
References in periodicals archive ?
This causes the rock to spall ahead of the bit, breaking to the surface with a conchoidal fracture.
In relation to the figures I do not understand why the authors chose the image they did, to illustrate the dorsal surface of a flake produced through conchoidal fracture (Fig.
The relative sharpness of the edge, the appearance of conchoidal fracture, and transparency serve to recognize a freshly broken surface.
It is brittle with a conchoidal fracture, and has a good cleavage parallel to {001} and no observable parting.