AskDefine | Define prismatic

Dictionary Definition

prismatic adj
1 of or relating to or resembling or constituting a prism; "prismatic form"
2 exhibiting spectral colors formed by refraction of light through a prism; "prismatic light"

User Contributed Dictionary



  1. Of or pertaining to a prism; having the form of a prism.
  2. Separated or distributed by, or as if by, a transparent prism; formed by a prism; varied or brilliant in color.


Extensive Definition

In geology and petrology, a prism is a long, narrow, wedge-shaped sedimentary body with a width to thickness ratio greater than 5 to 1 but less than 50 to 1, and a length 1.5 to 3 times its width.
These types of sediments are typically formed during orogenic deformation. For example, the arkoses found in fault troughs.
"Prismatic" is also type of mineral habit (appearance of a crystal). Prismatic minerals have crystals that show a uniform cross-section.


Synonyms, Antonyms and Related Words

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