dacite

American  

[day-sahyt] / ˈdeɪˌsaɪt /

noun

dacites plural

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

---

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.

---

Other Word Forms

Derived Forms

• dacitic
  adjective

Inflected Forms

Nouns

• dacites
  plural

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

Chunks of juvenile gray dacite fell like hail, some as large as golf balls.

From Scientific American ● Jan. 24, 2013

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

All this gossan and porphyry, and that copper stain up there–and just look at that dacite cap!”

From Silver and Gold A Story of Luck and Love in a Western Mining Camp by Coolidge, Dane

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

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

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

Other dacites, especially augite- and enstatite-dacites, are darker coloured.

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

The rocks are liparites, dacites, hornblende and pyroxene andesites.

From Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 2 "Chicago, University of" to "Chiton" by Various