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 ?
5 Y 8/3) cortex 2-5 mm thick, typical conchoidal fracture and no visible macroscopic defects (FIGURE 3A).
It has a typical conchoidal fracture and contains abundant light grey (2.