Staining of thin sections for plagioclase and alkali feldspar has not become a universally applied petrographic tool, probably due to difficulties encountered in effectively staining plagioclase. Modifications of standard techniques are described for rapidly producing stained thin sections of high quality. Critical steps in the procedure include pre-polishing with wet 600-grit abrasive paper, using adequate etching times, and applying a K-rhodizonate solution of 0.02 g per 30 ml water, or weaker.

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