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 structure makes BSM very similar to chert in nature and strength, able to fracture conchoidally and maintain a sharp cutting edge, thus making it an effective choice for flaked cutting tools.
As a raw material, quartz is renowned as an effective choice for flaking due to its ability to be flaked conchoidally and to maintain a sharp cutting edge, similar to the BSM.
An examination of the debris on my own knapping floor suggests that waisting is not necessarily diagnostic of flakes initiated by bending fractures and, like the waisting on the conchoidally flaked piece in Fig.