adjective Mineralogy.
noting a shell-like fracture form produced on certain minerals by a blow.

1660–70; conchoid + -al1

conchoidally, adverb
subconchoidal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
conchoidal (kɒŋˈkɔɪdəl)
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

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
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