Columnar structure


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(Geol.) a structure consisting of more or less regular columns, usually six-sided, but sometimes with eight or more sides. The columns are often fractured transversely, with a cup joint, showing a concave surface above. This structure is characteristic of certain igneous rocks, as basalt, and is due to contraction in cooling.<- as="" at="" giant's="" causeway,="" ireland="" -="">
See under Columnar.

See also: Columnar, Structure

References in periodicals archive ?
To produce an aligned particle structure, the magnetic field is applied to the matrix during cross-linking so that the columnar structure of magnetizable particles can be formed and become locked in place upon the final cure.
The coatings have a columnar structure, which is similar with previous studies.
7% Fe condensates, a large proportion of the crystals have the columnar structure with fully fragmented twins, oriented in the direction normal to their growth <111>(Figure 2b).
1 is different from the columnar structure of acrotretoid brachiopod shells (Williams & Holmer 1992), as well as from that of Mickwitzia shells (Skovsted & Holmer 2003), where columns penetrate initially organic-rich layers.
Using the Welsh system must take the columnar structure of such basis importance, even easier to understand.
If this is seen as a model, both the monumental columnar structure and the rotunda immediately yield much deeper resonances.
On the other hand, the columnar structure was not observed at higher target current (3.
For areas with maximum content of molybdenum an unclearly pronounced columnar structure with prevailing content of molybdenum (light field) and increased content of copper (dark field) is characteristic (Figure 5).
The observed solidification pattern [38] shows a columnar structure (cellular in CPTi, but dendritic in Ti6/4) in the portion of the ingot which solidified whilst the steady-state melting was taking place, i.
This change is due to the migration of particles and formation of a chainlike or columnar structure oriented along the electric field direction over the gap between the electrodes (1-3).