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

Nouns

• dacites
  plural

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Example Sentences

See Examples For:

dacite dacites

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

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

Mount Elden dominates the picture, a large exogenous dacite dome.

From Scientific American ● Dec. 6, 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

"I wonder if they are visible from the dacite elevation on which SHE lives."

From Of All Things by Robert C. Benchley

Interbedded volcanic rocks, andesites, dacites, diabases, with agglomerates and tuffs constitute an important feature, and attain a thickness of 6000 ft. in the Pentland and Ochil hills.

From Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 3 "Destructors" to "Diameter" by Various

But felsite or microfelsite is still the generally accepted designation for that very fine-grained, almost crypto-crystalline substance which forms the ground-mass of so many rhyolites, dacites and porphyries.

From Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 2 "Fairbanks, Erastus" to "Fens" by Various

Their felspar ranges from oligoclase to andesite and labradorite, and is often very zonal; sanidine occurs also in some dacites, and when abundant gives rise to rocks which form transitions to the rhyolites.

From Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 8 "Cube" to "Daguerre, Louis" by Various

The whole of this consists of tuffs and lavas, andesites prevailing in the west and rhyolites and dacites in the east.

From Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 3 "Borgia, Lucrezia" to "Bradford, John" by Various

In the hand specimen many of the hornblende and biotite dacites are grey or pale brown and yellow rocks with white felspars, and black crystals of biotite and hornblende.

From Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 8 "Cube" to "Daguerre, Louis" by Various

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