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columnar


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Applied to the habit or shape of a crystal that is rod-like, with parallel faces, giving it the appearance of a column. Rocks such as basalts and dolerites may cool and develop a polygonal system of joints, usually at right angles to the cooling surfaces of the igneous body; the joints are well exposed by weathering. This feature is known as ‘columnar jointing’.

Subjects: Earth Sciences and Geography.


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