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We detail a method for hand picking potassium-rich feldspars from silicic tephra. The method, based on the well known sodium cobaltinitrite staining technique, is applicable to any sample where K content of feldspar exceeds ∼2wt%. The method is well suited to mineral grains >0.25mm and useful for grains as small as ∼0.125mm. Alkali feldspar, plagioclase, and quartz are easily distinguishable after...
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