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alkali feldspar

   Also found in: Encyclopedia 0.04 sec.
alkali feldspar
Any of several feldspar minerals containing alkali metals and little calcium. Plagioclase, orthoclase and microcline are alkali feldspars.
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Interstitial alkali feldspar No modal alkali feldspar.
Celestial climate driver: a perspective from four billion years of ... by Veizer, Jan / Geoscience Canada
Plagioclase dramatically removes Sr at intermediate stages and alkali feldspars sequester Ba and Rb as late-stage trachytes and phonolites form in alkaline magmas.
Igneous rock associations 4. Oceanic island volcanism I mineralogy ... by Mallory-Greenough, Leanne M. / Geoscience Canada
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