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Shale

Shale

Shale is a fine-grained sedimentary rock whose original constituents were clay minerals or muds. It is characterized by thin laminae[1] breaking with an irregular curving fracture, often splintery and usually parallel to the often-indistinguishable bedding plane. This property is called fissility. Non-fissile rocks of similar composition but made of particles smaller than 1/16 mm are described as mudstones. Rocks with similar particle sizes but with less clay and therefore grittier are siltstones. Shale is the most common sedimentary rock.[2]


See alsoEdit

FootnotesEdit

  1. ^ "shale". Chambers Dictionary of Science and Technology. Chambers Harrap Publishers Ltd. 1999. 
  2. ^ "Rocks: Materials of the Lithosphere - Summary". http://wps.prenhall.com/esm_lutgens_foundations_3/0,6540,354318-,00.html. Retrieved on 2007-07-31. 


ReferencesEdit

  • Blatt, Harvey and Robert J. Tracy, 1996, Petrology: Igneous, Sedimentary and Metamorphic, 2nd ed., Freeman, ISBN 0-7167-2438-3
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