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A conchoidal fracture is a break or fracture of a brittle material that does 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". [1]
- Fracture (mineralogy)
Conchoidal fracture breakage that resembles the concentric...
- Fracture
In brittle crystalline materials, fracture can occur by...
- Fracture (mineralogy)
Conchoidal fracture breakage that resembles the concentric ripples of a mussel shell. It often occurs in amorphous or fine-grained mineraloids such as flint, opal or obsidian, but may also occur in crystalline minerals such as quartz. Subconchoidal fracture is similar to conchoidal
In brittle crystalline materials, fracture can occur by cleavage as the result of tensile stress acting normal to crystallographic planes with low bonding (cleavage planes). In amorphous solids, by contrast, the lack of a crystalline structure results in a conchoidal fracture, with cracks proceeding normal to the applied tension.
貝殻状断口 （Conchoidal fracture）は、割れ口が同心円の波紋状になっているもの。. 二枚貝の貝殻に似ている。. 燧石 、 オパール 、 黒曜石 など、 アモルファス やきめの細かい鉱物でこのような断口となるが、 石英 のように結晶構造を持つ鉱物でも ...
Conchoidal fracture is a smoothly curving fracture surface of fine-grained materials which have no planar surfaces of internal weakness or planes of separation (no cleavage). Such a curving fracture surface is characteristic of glass and other brittle materials with no crystal structure.
Figure 3.61 shows a sample of quartz displaying conchoidal fracture. Other kinds of fracture include even fracture , hackly fracture, splintery fracture , and others. The terms we use to describe fracture and cleavage are plentiful; the most commonly used terms are defined in the tables below.
conchoidal fracture. fracture, in mineralogy, appearance of a surface broken in directions other than along cleavage planes. There are several kinds of fractures: conchoidal (curved concavities resembling shells— e.g., flint, quartz, glass); even (rough, approximately plane surfaces); uneven (rough and completely irregular surfaces, the ...
