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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  
/ dāsīt′ /
  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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Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

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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 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

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 Benchley, Robert C.

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

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 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

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

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