foliation


fo·li·a·tion

noun \ˌfō-lē-ˈā-shən\

Definition of FOLIATION

1
a :  the process of forming into a leaf
b :  the state of being in leaf
c :  vernation
2
:  the numbering of the leaves of a manuscript or early printed book
3
a :  ornamentation with foliage
b :  a decoration resembling a leaf
4
:  the enrichment of an opening by foils
5
:  foliated texture

First Known Use of FOLIATION

circa 1623

foliation

noun    (Concise Encyclopedia)

Planar arrangement of structural or textural features in any rock type, but particularly that resulting from the alignment of constituent mineral grains of a metamorphic rock along straight or wavy planes. Foliation commonly occurs parallel to original bedding, but it may not be obviously related to any other structural direction. Foliation is exhibited most prominently by sheety minerals, such as mica or chlorite.

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