columnar jointing


columnar jointing
(in basaltic igneous rocks) a series of generally hexagonal columns formed by vertical joints as a result of contraction during cooling.

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Universalium. 2010.

Look at other dictionaries:

  • columnar jointing — GLOSSARY OF VOLCANIC TERMS A type of fracture pattern resulting from the thermal contraction of hot volcanic rocks after their crystallization which commonly is expressed in elongate, pentagonal or hexagonal columns oriented perpendicular to the… …   Glossary of volcanic terms

  • columnar jointing — /kəˌlʌmnə ˈdʒɔɪntɪŋ/ (say kuh.lumnuh joynting) noun that variety of jointing which breaks the rock into columns, especially of basaltic rock in which the joints form a hexagonal pattern by shrinkage during cooling …   Australian English dictionary

  • columnar jointing — (in basaltic igneous rocks) a series of generally hexagonal columns formed by vertical joints as a result of contraction during cooling …   Useful english dictionary

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  • joint — /joynt/, n. 1. the place at which two things, or separate parts of one thing, are joined or united, either rigidly or in such a way as to permit motion; juncture. 2. a connection between pieces of wood, metal, or the like, often reinforced with… …   Universalium


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