Conchoidal fracture - definition of Conchoidal fracture by The Free Dictionary
conchoidal (redirected from Conchoidal fracture)
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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.]
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
con•choi•dal (kɒŋˈkɔɪd l)
denoting a fracture shape whose surface resembles the inside of a clamshell, characteristic of certain minerals.
References in periodicals archive
The reason for natural corundum being particularly suitable for grinding is its prominent basal cleavage that causes the crystal to break readily with a smooth flat surface at right angles to the axis of elongation through successive reductions in size unlike synthetic corundum (alumina), which has a conchoidal fracture
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
There is also misunderstanding of the term conchoidal fracture
, which is an intrinsic property of some rocks, not a technique of knapping as suggested in some chapters.