Encyclopedia of Planetary Landforms

2015 Edition
| Editors: Henrik Hargitai, Ákos Kereszturi


Reference work entry
DOI: https://doi.org/10.1007/978-1-4614-3134-3_539


In sedimentary, igneous, and metamorphic environments, the word spherule generally refers to a small sphere or spherical body in μm to mm size range, which is mostly composed of radially arranged crystals (Wolf 1978; Jongerius and Rutherford 1979; Best 2003; Zhou and Chafetz 2009; Glass and Simonson 2013).


Blueberry (Mars); Nodule (used as synonym of spherule or for large, coated spherules)

Subtypes on Earth

  1. (1)

    Nodules (especially in soil-sedimentary environments): Nodules are such pedofeatures, which are related to natural surfaces or voids of the sediment matrix (Stoops 2003), and represent local concentration of chemical compounds (Yaalon 1978). Nodules are differing from the sediment in hardness, color, fabric, and composition (Yaalon 1978). They can possess different external and internal morphology by reason of matrix texture, alternation of precipitation and dissolution processes, and stability of the sediment structure (Wieder and Yaalon 1982;...

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • Gabriella Barta
    • 1
  • D. C. Golden
    • 2
  • John C. Dixon
    • 3
  1. 1.Department of Physical GeographyEötvös Loránd University, Institute of Geography and Earth SciencesBudapestHungary
  3. 3.Department of Geosciences, University of ArkansasFayettevilleUSA