Encyclopedia > Schist

  Article Content


The schists form a group of metamorphic rocks chiefly notable for the preponderance of lamellar minerals such as micas, chlorite, talc, hornblende, graphite, etc. Quartz often occurs in drawn-out grains to such an extent that quartz schist is produced. Most schists have in all probability been derived from clays and muds[?] which have passed through a series of metamorphic processes involving the production of shales, slates and phyllites[?] as intermediate steps. Certain schists have been derived from fine-grained igneous rocks such as lavas and tuffs. Most schists are mica schists, but graphite and chlorite schists are common. Schists are named for their prominent or perhaps unusual mineral constituents, such as garnet schist, tourmaline schist, glaucophane[?] schist, etc. The word schist is derived from the Greek meaning to split, which is in reference to the ease with which schists can be split along the plane in which the platy minerals lie.

See also: List of minerals

All Wikipedia text is available under the terms of the GNU Free Documentation License

  Search Encyclopedia

Search over one million articles, find something about almost anything!
  Featured Article
Canadian Charter of Rights and Freedoms

... Canada (2002-) Humphrey, J.P., Human Rights and the United Nations: A Great Adventure (New York: Transnational Publishers, 1984) Beaudoin G.-A. & E. Ratushny, The ...

This page was created in 23 ms