conchoidal

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con·choi·dal

 (kŏng-koid′l)
adj.
Of, relating to, or being a surface characterized by smooth, shell-like convexities and concavities, as on fractured obsidian.
[From Greek konkhoeidēs, mussellike : konkho-, concho- + -oeidēs, -oid.]
con·choi′dal·ly adv.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

conchoidal

(kɒŋˈkɔɪdəl)
adj
1. (Geological Science) (of the fracture of minerals and rocks) having smooth shell-shaped convex and concave surfaces
2. (Geological Science) (of minerals and rocks, such as flint) having such a fracture
conˈchoidally adv
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

con•choi•dal

(kɒŋˈkɔɪd l)

adj.
denoting a fracture shape whose surface resembles the inside of a clamshell, characteristic of certain minerals.
[1660–70]
con•choi′dal•ly, adv.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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The bitumen observed on the core DS1 was described as hard, brittle, steel-gray, insoluble in chloroform, conchoidal fracture, and nonfluorescent.
Distribution and Thermal Maturity of Devonian Carbonate Reservoir Solid Bitumen in Desheng Area of Guizhong Depression, South China
It was opaque black with a vitreous lustre and a surface that showed conchoidal fracture patterns.
Shungite for jewellery use
Silcrete may be distinguished from other siliceous rocks by its lustrous conchoidal fracture; it is so strongly cemented that it fractures evenly through grains and matrix, whereas many quartzites fracture around the grains.
Silcrete quarries and artefact distribution in the Central Queensland Highlands, Eastern Australia
The best quality were deemed to be of French or English origin, translucent with a smooth surface of a "uniform tint of light yellow or brown color, and slightly conchoidal fracture."
One hell of a horse pistol: considered by many to be the finest military flintlock sidearm ever, the .54-caliber U.S. Model 1836 may be the best-looking as well
Holfertite has perfect cleavage on {110} and an uneven to conchoidal fracture. In transmitted plane-polarized light, holfertite is non-pleochroic, colorless, uniaxial positive, [omega] = 1.815 [+ or -] 0.008, [epsilon] = 1.910 [+ or -] 0.008.
Holfertite: a new hydroxyl-hydrated uranium titanate from Starvation Canyon, Thomas Range, Utah

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