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greisen

greisen An altered, light-coloured, igneous rock consisting of white mica and quartz. The rock forms by the reaction of crystalline granite with hot fluorine-rich vapour derived from the crystallizing granite at a deeper level in the intrusion. The granite mineralogy is unstable in the presence of this vapour and reacts to give the stable mica-quartz assemblage. This process is termed pneumatolysis. Greisens are found as marginal modifications to granite adjacent to mineral veins, as thin veins and dykes in granite fissures, and as large bodies at the tops and sides of granite intrusions.

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"greisen." A Dictionary of Earth Sciences. . Encyclopedia.com. 16 Aug. 2017 <http://www.encyclopedia.com>.

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"greisen." A Dictionary of Earth Sciences. . Retrieved August 16, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/greisen

greisen

greisenItalian, stallion •cañon, canyon, companion •hellion, rebellion •Kenyan •Melanesian, Micronesian, Polynesian •billion, jillion, million, modillion, multimillion, pillion, septillion, sextillion, squillion, trillion, zillion •minion, opinion, pinion •carillon • slumgullion •bunion, Bunyan, grunion, onion, Runyon •roentgen • damson • Kansan • Tarzan •blazon, brazen, emblazon, liaison, raisin •Spätlesen •reason, season, treason •arisen, grison, imprison, mizzen, prison, risen, uprisen •Pilsen • crimson • malison •benison, denizen •orison • citizen •bedizen, greisen, horizon, kaizen •Stockhausen •chosen, frozen •Lederhosen • poison • Susan •cousin, cozen, dozen •Amazon

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"greisen." Oxford Dictionary of Rhymes. . Encyclopedia.com. 16 Aug. 2017 <http://www.encyclopedia.com>.

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"greisen." Oxford Dictionary of Rhymes. . Retrieved August 16, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/greisen