Definitions
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 highiron 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
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
from Wiktionary, Creative Commons Attribution/Share-Alike License
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Examples
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Basalt magma typically generates very little ash compared to other types (andesite, dacite, and rhyolite).
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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.
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An intrusive complex of dacite with sedimentary and metamorphic rocks of Palaeozoic age comprise the predominant rock forms.
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Rocks formed from felsic magma include granite, granodiorite, dacite, and rhyolite.
Igneous rock 2007
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Rhyolite and dacite are produced from continental lava flows that solidify quickly.
Igneous rock 2007
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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.
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They cover up to 100 miles of trail beneath silver wattle and broad-leaf peppermint trees, scramble across crumbly dacite rocks.
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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 2011
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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.
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Dacite lava hand sample, with abundant amphibole and plagioclase feldspar. magma mixing or crustal assimilation (by another magma) to form the dacite.
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