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Having elevations or depressions in form like one half of a bivalve shell; -- applied principally to a surface produced by fracture.

e variety of quartz, in color usually of a gray to brown or nearly black, breaking with a conchoidal fracture and sharp edge. It is very hard, and strikes fire with steel.

The texture of a freshly broken surface; as, a compact fracture; an even, hackly, or conchoidal fracture. Comminuted fracture (Surg.), a fracture in which the bone is broken into several parts. -- Complicated fracture (Surg.), a fracture of the bone combined with the lesion of some artery, nervous trunk, or joint. --…

ard, brittle, translucent, and commonly transparent substance, white or colored, having a conchoidal fracture, and made by fusing together sand or silica with lime, potash, soda, or lead oxide. It is used for window panes and mirrors, for articles of table and culinary use, for lenses, and various articles of ornament.…