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

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

I went to school at the foot of a mountain made of dacite, the same kind of magma that blew Mount St. Helens apart.

From Scientific American ● Dec. 6, 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 Dane Coolidge

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

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

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