Pencil cleavage

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Pencil cleavage in limestone; surveying compass for scale

Pencil cleavage in geology refers to a cleavage in rock such that long, slender, pencil-shaped fragments of rock are created by fracturing during the weathering of a sedimentary rock. Pencil cleavage is usually associated with rock units that contain high angle of intersection between cleavages, such as a diagentic cleavage and a later tectonic cleavage.[1]

See also[edit]


  1. ^ Licker, Mark D. (2002). Dictionary of Earth Science. (2. ed.). New York [u.a.]: McGraw-Hill. p. 269. ISBN 0071410457.