Definitions
American Heritage® Dictionary of the English Language, Fourth Edition
- n. A light gray volcanic rock containing a mixture of plagioclase and other crystalline minerals in glassy silica, similar in appearance to rhyolite.
Century Dictionary and Cyclopedia
- n. 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. Dacite consists essentially of plagioclase and quartz, together with one or more minerals belonging to the biotite, hornblende, and pyroxene families. The ground-mass is very variable in structure and character. Dacite rarely occurs except in a more or less altered form, and is especially interesting as being one of the rocks associated with occurrences of the precious metals and their ores in Transylvania and the Cordilleran regions of North and South America. It is a rock the composition and classification of which has been the cause of much discussion among geologists. See
rhyolite .
Wiktionary
WordNet 3.0
- n. a grey volcanic rock containing plagioclase and quartz and other crystalline minerals
Etymologies
- 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. (Wiktionary)
- After Dacia . (American Heritage® Dictionary of the English Language, Fourth Edition)
Examples
“Basalt magma typically generates very little ash compared to other types (andesite, dacite, and rhyolite).”
“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.”
“An intrusive complex of dacite with sedimentary and metamorphic rocks of Palaeozoic age comprise the predominant rock forms.”
“Rocks formed from felsic magma include granite, granodiorite, dacite, and rhyolite.”
“Rhyolite and dacite are produced from continental lava flows that solidify quickly.”
“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.”
“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.”
“They cover up to 100 miles of trail beneath silver wattle and broad-leaf peppermint trees, scramble across crumbly dacite rocks.”
“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.”
“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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