Monzonite

Monzonite
Igneous rock
Monzonite specimen from Rock Library (NASA JPL)
Composition
Mostly plagioclase and alkali feldspar
Not to be confused with the rare earth-bearing phosphate mineral Monazite.

Monzonite is an igneous intrusive rock, formed by slow cooling of underground magma that has a moderate silica content and is enriched in alkali metal oxides. Monzonite is composed mostly of plagioclase and alkali feldspar.

Syenodiorite is an obsolescent term for monzonite[1] or for monzodiorite.[2] Larvikite is a particular form of monzonite.[3]

  1. ^ Allaby, Michael, ed. (2013). "Monzonite". A dictionary of geology and earth sciences (Fourth ed.). Oxford: Oxford University Press. ISBN 9780199653065.
  2. ^ Le Maitre, R.W., Igneous Rocks: A Classification and Glossary of Terms Cambridge University Press, 2nd ed, pp. 113 ISBN 0-521-66215-X
  3. ^ Cite error: The named reference andersen-1984 was invoked but never defined (see the help page).