Aplite

Aplite
Aplite (fine-grained center)
Composition
Quartz, feldspar
Aplite dyke cutting Sentinel granodiorite on Sentinel Dome
Aplite, showing fine-grained texture

Aplite (/ˈæplt/) is an intrusive igneous rock that has a granitic composition. Aplites are fine-grained to aphanitic (without grains visible to the naked eye) and may consist of only quartz and feldspar or the term may refer to any leucocratic (pale-coloured) minor intrusion of that grain size.[1] They are associated with the later stages of many larger intermediate to felsic intrusions.

  1. ^ Le Maitre R.W.; Streckeisen A.; Zanettin B.; Le Bas M.J.; Bonin B.; Bateman P. (2005). Igneous Rocks: A Classification and Glossary of Terms: Recommendations of the International Union of Geological Sciences Subcommission on the Systematics of Igneous Rocks (2 ed.). Cambridge University Press. p. 58. ISBN 9781139439398.