Definition of conchoidal in English:

Share this entry


Pronunciation: /kɒŋˈkɔɪd(ə)l/


chiefly Mineralogy
Denoting a type of fracture in a solid (such as flint) which results in a smooth rounded surface resembling the shape of a scallop shell.
Example sentences
  • It occurs on conchoidal fracture surfaces developed in clay and tuffaceous sandstone on the Green Velvet claims, Inyo County, and as ‘specimens’ on the Wakefield property near Pozo, San Luis Obispo County.
  • Quartz-grain microtextures have received particular attention, and many distinctive textural features, such as conchoidal fractures and stepped surfaces, have been classified.
  • The conchoidal fracture exhibited by chert and obsidian allows them to be shaped into sharp points and edges.

For editors and proofreaders

Line breaks: con|choid¦al

Share this entry

What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.