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conchoidal

[ kong-koid-l ]

adjective

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


conchoidal

/ 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-koidl /

  1. 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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Derived Forms

  • conˈchoidally, adverb
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Other Words From

  • con·choidal·ly adverb
  • subcon·choidal adjective
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Word History and Origins

Origin of conchoidal1

First recorded in 1660–70; conchoid + -al 1
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Example Sentences

Very compact and fine-grained reddish granular quartz, with a glistening lustre, and flat conchoidal fracture.

I am told conchoidal white lime-stone meets it on both the east and west sides.

In the form of translucent fragments, with a highly conchoidal fracture, among the debris of the shores of Lake Pepin.

At ordinary temperatures ebonite is hard and brittle and breaks with a well-marked conchoidal fracture.

The fracture of this fossil is perfectly conchoidal, sometimes glossy, and sometimes dull on the surface.

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conchoidconchology