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Definition of Conchoidal
1. a. Having elevations or depressions in form like one half of a bivalve shell; -- applied principally to a surface produced by fracture.
Definition of Conchoidal
1. Adjective. (minerology) Describing a type of irregular fracture that occurs in materials with no natural plane of separation, such as flint. ¹
2. Adjective. (context: of the fracture of minerals and rocks) having smooth shell-shaped convex and concave surfaces. ¹
3. Adjective. (context: of minerals and rocks, such as flint) having such a fracture. ¹
¹ Source: wiktionary.com
Definition of Conchoidal
1. [adj]
Medical Definition of Conchoidal
1. Shaped like a shell; having alternate convexities and concavities on the surface. Origin: concha + G. Eidos, appearance (05 Mar 2000)
Lexicographical Neighbors of Conchoidal
Literary usage of Conchoidal
Below you will find example usage of this term as found in modern and/or classical literature:
1. Bulletin of the American Museum of Natural History by American Museum of Natural History (1907)
"Layer H. Two feet of thick gray shale, with conchoidal fracture; many plants,
but no insects. 3. About 8 feet of similar shale, but more laminated, ..."
2. A System of Mineralogy: In which Minerals are Arranged According to the by ROBERT. JAMESON (1820)
"The fracture is perfect and flat conchoidal, also small conchoidal. The fragments
are indeterminate angular, and sharp- edged. It is harder than gypsum, ..."
3. A Dictionary of Chemistry: On the Basis of Mr. Nicholson's, in which the ...by Andrew Ure, William Nicholson by Andrew Ure, William Nicholson (1821)
"Surface of the cells drusy. fracture flat conchoidal. ... Fracture flat conchoidal.
Semi-transparent. Refracts double. As hard as gypsum. Sp. gr. ..."
4. Outlines of Oryctology: An Introduction to the Study of Fossil Organic by James Parkinson (1830)
"... versely with an imperfect conchoidal fracture, with a shining resinous lustre,
and sometimes yielding the appearance of the markings of wood. ..."
5. A System of Mineralogy: Descriptive Mineralogy, Comprising the Most Recent by James Dwight Dana, George Jarvis Brush (1875)
"Fracture of fine massive varieties flat-conchoidal and splintery. Sometimes presenting
a bluish fluorescence. Phosphoresce* •when heated. ..."
6. A Manual of Mineralogy by Arthur Aikin (1814)
"Scratches glass with ease; fracture conchoidal; lustre shining, vitreous. ...
Dull green with yellow and whitish dots; v fracture flat-conchoidal; ..."
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