DEFINITION OF SCHIST

A strongly foliated crystalline metamorphic rock

characterized by the parallel alignment of more than 50 percent

of minerals present, especially platy or elongate prismatic

minerals such as micas and hornblende. The strong

alignment of platy minerals causes schists to break into slabs

or thin flakes. Schists are coarser grained and form at higher

metamorphic grades than slates, although the pre-metamorphic

protolith of both rock types may be the same muddy

sediment. The foliation in schists is called schistosity. There

are many different types of schist named on the basis of

main and accessory minerals present. Mica schists are the

most common, and compound names are typically used to

describe schists with prominent accessory minerals, such as

garnet-mica schist, hornblende-biotite schist, or cordieritemica

schists.

See also DEFORMATION OF ROCKS; METAMORPHISM.

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