enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. Cleavage (geology) - Wikipedia

    en.wikipedia.org/wiki/Cleavage_(geology)

    Cleavage is a type of rock foliation, a fabric element that describes the way planar features develop in a rock. Foliation is separated into two groups: primary and secondary. Primary deals with igneous and sedimentary rocks, while secondary deals with rocks that undergo metamorphism as a result of deformation. Cleavage is a type of secondary ...

  3. Cleavage (crystal) - Wikipedia

    en.wikipedia.org/wiki/Cleavage_(crystal)

    Cleavage is a physical property traditionally used in mineral identification, both in hand-sized specimen and microscopic examination of rock and mineral studies. As an example, the angles between the prismatic cleavage planes for the pyroxenes (88–92°) and the amphiboles (56–124°) are diagnostic.

  4. Crenulation - Wikipedia

    en.wikipedia.org/wiki/Crenulation

    In a geological context, crenulation or crenulation cleavage is a fabric formed in metamorphic rocks such as phyllite, schist and some gneiss by two or more stress directions causing the formation of the superimposed foliations.

  5. Mineral - Wikipedia

    en.wikipedia.org/wiki/Mineral

    As cleavage is a function of crystallography, there are a variety of cleavage types. Cleavage occurs typically in either one, two, three, four, or six directions. Basal cleavage in one direction is a distinctive property of the micas. Two-directional cleavage is described as prismatic, and occurs in minerals such as the amphiboles and pyroxenes.

  6. Glossary of geology - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_geology

    Also called Indianite. A mineral from the lime-rich end of the plagioclase group of minerals. Anorthites are usually silicates of calcium and aluminium occurring in some basic igneous rocks, typically those produced by the contact metamorphism of impure calcareous sediments. anticline An arched fold in which the layers usually dip away from the fold axis. Contrast syncline. aphanic Having the ...

  7. Cleavage - Wikipedia

    en.wikipedia.org/wiki/Cleavage

    Cleavage (crystal), the way in which a crystal or mineral tends to split; Cleavage (embryo), the division of cells in an early embryo; Cleavage (geology), foliation of rock perpendicular to stress, a result of ductile deformation; Cleave (fiber), a controlled break in an optical fiber

  8. Mica - Wikipedia

    en.wikipedia.org/wiki/Mica

    This characteristic is described as perfect basal cleavage. Mica is common in igneous and metamorphic rock and is occasionally found as small flakes in sedimentary rock. [6] It is particularly prominent in many granites, pegmatites, and schists, [7] and "books" (large individual crystals) of mica several feet across have been found in some ...

  9. Rock (geology) - Wikipedia

    en.wikipedia.org/wiki/Rock_(geology)

    The use of rock has had a huge impact on the cultural and technological development of the human race. Rock has been used by humans and other hominids for at least 2.5 million years. [22] Lithic technology marks some of the oldest and continuously used technologies. The mining of rock for its metal content has been one of the most important ...