- noting a shell-like fracture form produced on certain minerals by a blow.
Origin of conchoidal
Examples from the Web for conchoidal
Historical Examples of 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
- Of or relating to a mineral or rock surface that is characterized by smooth, shell-like curves. Obsidian and quartz often have conchoidal fractures.