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A fine-grained light gray volcanic rock consisting primarily of quartz, plagioclase feldspar, and potassium feldspar, and also containing biotite, hornblende, or pyroxene.

[After Dacia.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


an igneous, volcanic rock characteristically light in colour with relatively high silica content
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.dacite - a grey volcanic rock containing plagioclase and quartz and other crystalline minerals
oligoclase, plagioclase - any of a series of triclinic feldspars that form rocks
volcanic rock - extrusive igneous rock solidified near or on the surface of the Earth
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References in periodicals archive ?
Main lithologies are a porphyritic dacite surrounded by a coarse-grained granodiorite.
Throughout the complex there are sills of gabbro, ultrabasic rocks and dacite porphyrite.
Three of the analysed samples from the latter formation contained > 63% Si[O.sub.2] (Appendix B), although only one of these plots in the rhyolite- dacite field based on immobile trace element ratios (Fig.lOa).
The lithology around CP is composed of gneiss (quartz-feldspars), shale (quartz-mica), marble, amphibolite, and quartzite from Permic to Jurassic [24] and metamorphic, granitic, and granodiorite rocks which are intruded by batholitic rocks [16], together with dacite and andesite from Miocene and rhyodacite from Quaternary [25].
--Neogene (Pliocene formations); covered the north watershed of basin, and appear as spot in middle basin, formed about 10.70 % of the total area, consist of gravel, sand, silt, pumice, and volcanic ash, with Augitehypersthene dacite welded tuff.
(1981) Geophysical characteristics of dacite volcanism--the 1977-1978 eruption of Usu volcano.