dacite

American  

[day-sahyt] / ˈdeɪˌsaɪt /

noun

plural

dacites

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

• dacitic adjective

Example Sentences

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

From Nature • Dec. 12, 2017

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

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

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

From Of All Things by Benchley, Robert C.