dacite

American  

[day-sahyt] / ˈdeɪˌsaɪt /

noun

dacites plural

1. Geology. a gray volcanic rock similar to andesite but bearing quartz as a distinct characteristic.

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dacite Scientific  

/ dā′sīt′ /

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

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Other Word Forms

Derived Forms

• dacitic
  adjective

Inflected Forms

noun

• dacites
  plural

Example Sentences

Eichelberger, J. C. Origin of andesite and dacite: evidence of mixing at Glass Mountain in California and at other circum-Pacific volcanoes.

From Nature • Dec. 12, 2017

I. Phase equilibria and pre-eruption P-T-fO2-fH2O conditions of the dacite magma.

From Nature • Dec. 12, 2017

Those gasses ripped and plucked existing rock from the debris avalanche and the ground, mixed that rock with the hot young dacite from the cryptodome, and hurled the whole mass along at incredible speeds.

From Scientific American • Dec. 13, 2012

Released from confining pressure, gasses within the thick dacite magma came out of solution and blew through upper slump block as it fell.

From Scientific American • Aug. 9, 2012

Lava streams, especially when they consist of rhyolite, dacite and some kinds of andesite, may rapidly solidify, and then become exceedingly brittle.

From Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 4 "Bradford, William" to "Brequigny, Louis" by Various