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What texture describes how magma cools and consolidates without growth of mineral grains ... What texture describes how mineral grains are of roughly equal size and coarse enough to be seen without a microscope or magnifying glass...
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geoscience.unlv.edu/pub/snelson/GEY101/study_guide_igne...
geoscience.unlv.edu/pub/snelson/GEY101/study_guide_igneous.html
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Bowen determined the sequence of mineral crystallization from a basaltic magma, and showed that two different types of reaction occur between crystalline solids and the magma as it cools. ... Texture refers to variations in the sizes and shapes of mineral grains in a rock, and the type of relationships between the...
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www.geo.ua.edu/intro03/Ignis.html
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Angle of repose: The steepest slope angle in which particular sediment will lie without cascading down. ... Arkose: A variety of sandstone containing abundant feldspar and quartz, frequently in angular, poorly sorted grains. ... Glass: A rock formed when magma is too rapidly cooled (quenched) to allow crystal growth.
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www.geotech.org/survey/geotech/dictiona.html
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Crystals embedded in fine-grained igneous rocks are termed "porphyritic." The porphyritic texture develops when some crystals grow to considerable size before the main mass of the magma consolidates into finer grained, ... Igneous rocks are formed when molten rock (magma) cools and solidifies, with or without crystallization.
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www.newworldencyclopedia.org/entry/Rock_(geology)
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A previously formed mineral reacts with the remaining liquid magma (the melt) so that it forms the next mineral in the sequence. ... If magma cools rapidly enough, the early-formed minerals do not have time to react with the melt, and thus all the ferromagnesian silicates in the discontinuous branch can be in one rock.
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www.wadsworthmedia.com/marketing/sample_chapters/049501...
www.wadsworthmedia.com/marketing/sample_chapters/0495010200_ch04.pdf
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; Mineral precipitation from solution: Malachite (a copper carbonate) precipitated in open spaces of a copper deposit. Each band marks a growth episode. ... ideal crystal shapes or irregular grains; etc.), and is in large parts influenced by the cooling history of the magma.
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www.indiana.edu/~geol105/1425chap5.htm
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the extrusive magma is deep below the surface and cools very slowly, producing very small mineral grains ... the extrusive magma cools quickly, so the mineral grains do not have time to grow ... B. magma cools and consolidates without the growth of mineral grains...
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wps.prenhall.com/esm_lutgens_foundations_4/0,9084,13131...
wps.prenhall.com/esm_lutgens_foundations_4/0,9084,1313117-,00.html
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Geology of the New York City region ... For instance, granite is an intrusive igneous rock in which the mineral grains display visible crystal surfaces. These crystals form when the magma cools very slowly within the insulating environment deep within the Earth.
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3dparks.wr.usgs.gov/nyc/common/geologicbasics.htm
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As the magma cools, plagioclase of progressively more albitic composition (Na ... Intrusive porphyritic textures are formed in cases where some minerals have crystallized from a magma over a long period, and then the magma is Note that rocks comprised of "glass" (as opposed to mineral grains) do not always look glassy.
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records.viu.ca/~earles/geol111/lectures/notes06.pdf
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