Spodumenes of high purity were examined spectrographically for minor impurities. Eleven samples from eight localities showed iron, manganese, titanium, gallium, sodium and potassium in all samples, tin in nine samples and rubidium in one. X-ray and petrographic studies show that the impurities are present in the spodumene itself, probably as isomorphous replacements. The iron and other objectionable impurities may be present in some spodumenes to such an extent as to limit their use in the ceramic field.The X-ray powder diffraction pattern for spodumene is given.

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