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Close-up of granite exposed in Chennai, India.

Phaneritic[1] is a term usually used to refer to igneous rock grain size. It means that the size of matrix grains in the rock are large enough to be distinguished with the unaided eye as opposed to aphanitic (which is too small to see with the naked eye). This texture forms by slow cooling of magma deep underground in the plutonic environment. It may also be applied to metamorphic rocks with the same definition.


  1. ^ Monroe, James Stewart; Wicander, Reed; Hazlett, Richard W. (2007). "4". In Dodson, Keith. Physical Geology: Exploring the Earth. Earth Sciences (in English) (6 ed.). USA: Thompson Brooks/Cole. p. 115. ISBN 0495011487.