conchoidal

[kong-koid-l]
adjective Mineralogy.
noting a shell-like fracture form produced on certain minerals by a blow.

Origin:
1660–70; conchoid + -al1

conchoidally, adverb
subconchoidal, adjective
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Collins
World English Dictionary
conchoidal (kɒŋˈkɔɪdəl)
 
adj
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
 
con'choidally
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
conchoidal   (kŏng-koid'l)  Pronunciation Key 
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
When obsidian breaks it fractures with a distinct conchoidal fracture.
Highly silicified examples flake with a good conchoidal fracture.
The silt and clay commonly display blocky to conchoidal rock fracture.
It is opaque, with a golden metallic color and conchoidal fracture.
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