plagioclasa
English translation: plagioclasic
| 00:19 Jun 22, 2008 |
| Spanish to English translations [PRO] Science - Geology / geological report | |||||||
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|  Selected response from: David Hollywood Local time: 13:30 | ||||||
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| 3 +2 | plagioclase |
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| 4 | plagioclasic |
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Answers
3 hrs confidence: 
plagioclasic Explanation: plagioclasic feldspar -------------------------------------------------- Note added at 3 hrs (2008-06-22 03:38:51 GMT) -------------------------------------------------- diaplectic glass of plagioclasic origin, (2) frequent 'mosaicism' in olivine ...... Takanashi, which was drawn on 1714, 4th year of Shotoku era. ... www.lpi.usra.edu/meetings/programs/metsoc94wa.txt - 817k - Cached - Similar pages -------------------------------------------------- Note added at 3 hrs (2008-06-22 03:39:58 GMT) -------------------------------------------------- that the plagioclasic feldspar components are transformed into a ... www.minersoc.org/pages/Archive-MM/Volume_38/38-294-197.pdf - Similar pages |
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16 mins confidence: peer agreement (net): +2
peer agreement (net): +2plagioclase Explanation: or plagioclase feldspar Feldspar is the most abundant mineral in rocks that are located at or near the earth's surface. Feldspar can have glassy white, blue, green, or red crystals. All feldspars contain silica and aluminum. When feldspars are exposed to the atmosphere they break down or weather easily. When they are broken down, feldspar forms other minerals, many of which are clay minerals. Feldspars also contain potassium which is a major nutrient for plant growth. The clays formed by weathered feldspar are used by pottery manufacturing plants. Kaolinite is the highest quality of the feldspar clays used by potters. Feldspar is number 6 on the Mohs hardness scale. Plagioclase is a form of feldspar that has a chemical make up of NaAlSi3O8. Plagioclase is usually white but can also be grey and greenish white. This mineral was abundant in the Moon rock samples. http://volcano.und.edu/vwdocs/vwlessons/lessons/Slideshow/Sh... http://www.mindat.org/min-9264.html http://es.wikipedia.org/wiki/Plagioclasa -------------------------------------------------- Note added at 16 hrs (2008-06-22 16:57:09 GMT) Post-grading -------------------------------------------------- Feldspar From Wikipedia, the free encyclopedia Jump to: navigation, search Lunar Ferroan Anorthosite #60025 (Plagioclase Feldspar). Collected by Apollo 16 from the Lunar Highlands near Descartes Crater. This sample is currently on display at the National Museum of Natural History in Washington, DC. United States (Unknown scale) Lunar Ferroan Anorthosite #60025 (Plagioclase Feldspar). Collected by Apollo 16 from the Lunar Highlands near Descartes Crater. This sample is currently on display at the National Museum of Natural History in Washington, DC. United States (Unknown scale) Feldspar is the name of a group of rock-forming minerals which make up as much as 60% of the Earth's crust.[1] Feldspars crystallize from magma in both intrusive and extrusive igneous rocks, and they can also occur as compact minerals, as veins, and are also present in many types of metamorphic rock.[2] Rock formed entirely of plagioclase feldspar (see below) is known as anorthosite.[3] Feldspars are also found in many types of sedimentary rock.[4] wiki link Ask GeoMan... Why is feldspar important? The feldspars are a family of silicate minerals which occur in igneous rocks. There are many different members to the feldspar group. Obviously, silica and oxygen form the foundation for the group, but calcium, sodium, and potassium are also present. One of these elements is usually dominant, but most of the feldspars contain all 3 in varying amounts. It is the proportions of these 3 elements which help determine which specific feldspar is formed. The feldspars are divided into 2 broad categories: plagioclase, which contains calcium and sodium; and orthoclase, which contains potassium. The plagioclase feldspars represent the "continuous branch" of Bowen's Reaction Series, and form a complete series between anorthite (the pure calcium member), and albite (the sodium-rich variety). I once saw an estimate that said that 60% of the earth's crust is composed of feldspar. This is quite a number, and since feldspar is nearly always present in igneous rocks, most classification schemes depend on the amount and kind of feldspar. In general terms, mafic and intermediate rocks contain plagioclase, with the more calcium present, the more mafic the resulting rock. Orthoclase occurs only in the felsic igneous rocks. http://jersey.uoregon.edu/~mstrick/AskGeoMan/geoQuerry34.htm... Basalt:7 Easy Chair Crater, Nye County. Plagioclase feldspar, olivine, and clinopyroxene found within the basalt. s. Look for small crystals of plagioclase feldspar (clear to white), olivine or peridot (green) or pyroxene (brownish black) in these dark vesicular volcanic rocks. http://vulcan.wr.usgs.gov/LivingWith/VolcanicPast/Places/vol... Plagioclase feldspars containing significant amounts of exsolved K-rich feldspar are called antiperthites. It is only in once-molten rocks quenched at very high temperatures that the full range of so-called high plagioclases exist as simple solid solutions. http://www.answers.com/topic/feldspar?cat=technology http://www.britannica.com/eb/article-9060278/plagioclase |
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