from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A fine-grained light gray volcanic rock consisting primarily of quartz, plagioclase feldspar, and potassium feldspar, and also containing biotite, hornblende, or pyroxene.

from The Century Dictionary.

  • noun A name first used by Fr. Von Hauer and Stache, in 1863, in describing the geology of Transylvania, to include the varieties of greenstone-trachyte which contain quartz.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun geology An igneous, volcanic rock with a high iron content.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a grey volcanic rock containing plagioclase and quartz and other crystalline minerals


from The American Heritage® Dictionary of the English Language, 4th Edition

[After Dacia.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From German Dazit, from Latin Dācia ("greater Romania"). First used in 1863 by Austrian geologists Franz von Hauer and Guido Stache, in a description of the geology of Transylvania.


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  • Basalt magma typically generates very little ash compared to other types (andesite, dacite, and rhyolite).

    volcanic ash hazards and ways to minimize them

  • For example, volcanic eruptions range from (1) effusion of lava fountains and flows with very little ash erupted, typical of basaltic magma eruptions; to (2) extremely explosive eruptions that inject large quantities of ash high into the stratosphere, typical of rhyolite and dacite magmatic eruptions.

    volcanic ash hazards and ways to minimize them

  • An intrusive complex of dacite with sedimentary and metamorphic rocks of Palaeozoic age comprise the predominant rock forms.

    Central Eastern Rainforest Reserves, Australia

  • Rocks formed from felsic magma include granite, granodiorite, dacite, and rhyolite.

    Igneous rock

  • Rhyolite and dacite are produced from continental lava flows that solidify quickly.

    Igneous rock

  • At Goldfield, Nevada, native gold is found in surface igneous flows of a dacite type, which have undergone extensive hydrothermal alterations characterized by the development of alunite (a potassium-aluminum sulphate), quartz, and pyrite.

    The Economic Aspect of Geology

  • They cover up to 100 miles of trail beneath silver wattle and broad-leaf peppermint trees, scramble across crumbly dacite rocks. Top Stories

  • Montierth explained that Tumtum and St. Helens were both formed out of thick, gooey lava that doesn't travel far as it cools into dacite rock.

    The Seattle Times

  • The 2009 drilling program identified widespread gold mineralization associated with mineralized and altered dacite porphyry and adjacent sedimentary and volcanic rocks, drill hole DDH09-014 revealed gold mineralization of 111 meters grading up to 7.28 grams/tonne.

    Marketwire - Breaking News Releases

  • Dacite lava hand sample, with abundant amphibole and plagioclase feldspar. magma mixing or crustal assimilation (by another magma) to form the dacite.

    ScienceBlogs Channel : Life Science


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