Encyclopedia > Syenite

  Article Content


Syenite is a coarse-grained intrusive igneous rock of the same general composition as granite but with the quartz either absent or present in relatively small amounts. The feldspars are alkaline in character and the dark mineral is usually hornblende. Soda-lime feldspars may be present in small quantities. The term syenite was originally applied to hornblende granite like that of Syene[?] in Egypt, from which the name is derived. Syenite is not a common rock, some of the more important occurrences being in New England, Arkansas, Montana, New York (syenite gneisses), Switzerland, Germany, and Norway.

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
Communes of the Gironde département

... sur l'Isle[?] - Saint Aubin de Blaye[?] - Saint Aubin de Branne[?] - Saint Aubin de Médoc[?] - Saint Avit de Soulège[?] - Saint Avit Saint Nazaire[?] - Saint Brice[?] - ...