A dependable, sensitive, and simple test for silicon is needed in determinative mineralogy. Several tests for silicon or silica have been proposed in the past but none of these is completely satisfactory. The test described here makes use of the precipitate suggested by Bořický1 for testing for sodium, namely, sodium fluosilicate. Behrens and Kley2 used this precipitate in testing for silicon, but their test lacks several of the advantages of this new method.

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