- noting a shell-like fracture form produced on certain minerals by a blow.
Origin of conchoidal
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for conchoidal
I noticed some conchoidal hollows more than a foot in diameter.The Maine Woods
Henry David Thoreau
It has a conchoidal fracture, and is without smell or taste.
Their fracture is conchoidal, with hmatitic (iron-ore pimpled) surface.Adrift in the Arctic Ice Pack
Elisha Kent Kane
When of good quality it is too hard to be scratched by the nail, has a conchoidal fracture, and a sp.
In colour they vary from ash-grey to black, and their fracture is conchoidal.
- (of the fracture of minerals and rocks) having smooth shell-shaped convex and concave surfaces
- (of minerals and rocks, such as flint) having such a fracture
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
- Of or relating to a mineral or rock surface that is characterized by smooth, shell-like curves. Obsidian and quartz often have conchoidal fractures.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.