Definitions for conchoidal
kɒŋˈkɔɪd lcon·choidal

WiktionaryRate this definition:0.0 / 0 votes

1. conchoidaladjective

   Describing a type of irregular fracture that occurs in materials with no natural plane of separation, such as flint.

2. conchoidaladjective

   having smooth shell-shaped convex and concave surfaces.

3. conchoidaladjective

   having such a fracture.

WikipediaRate this definition:0.0 / 0 votes

1. conchoidal

   Conchoidal fracture describes the way that brittle materials break or fracture when they do not follow any natural planes of separation. Mindat.org defines conchoidal fracture as follows: "a fracture with smooth, curved surfaces, typically slightly concave, showing concentric undulations resembling the lines of growth of a shell". Materials that break in this way include quartz, chert, flint, quartzite, jasper, and other fine-grained or amorphous materials with a composition of pure silica, such as obsidian and window glass, as well as a few metals, such as solid gallium. Crystalline materials such as quartz also exhibit conchoidal fractures when they lack a cleavage plane and do not break along a plane parallel to their crystalline faces. So, a conchoidal, or uneven, fracture is not a specific indication of the amorphous character of a mineral, or a material. Amorphous, cryptocrystalline, and crystalline materials can all present conchoidal fracture when they lack a preferential cleavage plane. Conchoidal fractures can occur in various materials if they are properly percussed (struck). Cryptocrystalline silica, such as chert, or flint, with this material property were widely sought after, traded, and fashioned into sharp tools in the Stone Age. Conchoidal fractures often result in a curved breakage surface that resembles the rippling, gradual curves of a mussel shell; the word "conchoid" is derived from the word for this animal (Ancient Greek: κογχοειδής konchoeidēs < κόγχη konchē). A swelling appears at the point of impact called the bulb of percussion. Shock waves emanating outwards from this point leave their mark on the stone as ripples. Other conchoidal features include small fissures emanating from the bulb of percussion. They are defined in contrast to the faceted fractures often seen in single crystals such as semiconductor wafers and gemstones and to the high-energy ductile fracture surfaces desirable in most structural applications.

Webster DictionaryRate this definition:0.0 / 0 votes

1. Conchoidaladjective

   having elevations or depressions in form like one half of a bivalve shell; -- applied principally to a surface produced by fracture

2. Etymology: [Cf. F. conchodal.]

How to pronounce conchoidal?

1. Alex

   US English

   David

   US English

   Mark

   US English

   Daniel

   British

   Libby

   British

   Mia

   British

   Karen

   Australian

   Hayley

   Australian

   Natasha

   Australian

   Veena

   Indian

   Priya

   Indian

   Neerja

   Indian

   Zira

   US English

   Oliver

   British

   Wendy

   British

   Fred

   US English

   Tessa

   South African

How to say conchoidal in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of conchoidal in Chaldean Numerology is: 3

2. Pythagorean Numerology

   The numerical value of conchoidal in Pythagorean Numerology is: 3

References

1. ^ Wiktionary
   https://en.wiktionary.org/wiki/Conchoidal
2. ^ Wikipedia
   https://en.wikipedia.org/wiki/Conchoidal
3. ^ Webster Dictionary
   https://www.merriam-webster.com/dictionary/conchoidal