Conchoidal


[kong-koid-l] /kɒŋˈkɔɪd l/

adjective, Mineralogy.
1.
noting a shell-like fracture form produced on certain minerals by a blow.
/kɒŋˈkɔɪdəl/
adjective
1.
(of the fracture of minerals and rocks) having smooth shell-shaped convex and concave surfaces
2.
(of minerals and rocks, such as flint) having such a fracture
conchoidal
(kŏng-koid’l)
Of or relating to a mineral or rock surface that is characterized by smooth, shell-like curves. Obsidian and quartz often have conchoidal fractures.

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