• synonyms


[ fel-sahyt ]
/ ˈfɛl saɪt /


a dense, fine-grained, igneous rock consisting typically of feldspar and quartz, both of which may appear as phenocrysts.

Nearby words

feloniously, felonry, felony, felony murder, felsic, felsite, felsitic, felspar, felspathic, felt, felt marker

Origin of felsite

First recorded in 1785–95; fels(par) + -ite1
Related formsfel·sit·ic [fel-sit-ik] /fɛlˈsɪt ɪk/, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for felsite

  • The stones themselves were felsite, which abounds in the locality.

    Unknown Mexico, Volume 1 (of 2)|Carl Lumholtz
  • We found, besides, a few cores of felsite and some shapeless flakes and several fragments of large metates.

British Dictionary definitions for felsite


felstone (ˈfɛlˌstəʊn)

/ (ˈfɛlsaɪt) /


any fine-grained igneous rock consisting essentially of quartz and feldspar
Derived Formsfelsitic (fɛlˈsɪtɪk), adjective

Word Origin for felsite

C18: fels(par) + -ite 1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Science definitions for felsite


[ fĕlsīt′ ]

A fine-grained, light-colored igneous rock, consisting mainly of feldspar and quartz.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.