columnar structure


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columnar structure

[kə′ləm·nər ‚strək·chər]
(geology)
(mineralogy)
Mineral structure consisting of parallel columns of slender prismatic crystals.
(petrology)
A primary sedimentary structure consisting of columns arranged perpendicular to the bedding.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Caption: Figure 2: The macrostructure of part of the 30 [micro]m/s withdrawn DS ingot showing the columnar structure (left) and dendritic structure (right).
[25] revealed that the strong (111) preferred orientations with fine columnar structure and little Cu content are essential to achieve better hardness in Zr-Cu-N nanocomposite coating system.
The cracking was even more severe in the case of the Ti[B.sub.2] (1.2 [micro]m thick, dense columnar structure, P6/mmm cell with lattice parameters of 3.009 [Angstrom], 3.009 [Angstrom], and 4.276 [Angstrom], grain size of ~33 nm, and effective elastic modulus of 430 GPa) with the hardness of 30 GPa shown in Figure 1(c).
The coatings have a columnar structure, which is similar with previous studies.
In the Cu-1.7% 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.
Both prismatic and columnar structure types refer to aggregates that are taller than they are wide.
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.