Recently a method using the Wig-L-Bug was described for grinding wool samples to a fine powder for use in the KBr disk technique for infrared spectral study <i>(1).</i> The possibility of using this grinding technique for mica was investigated, as homogeneous pulverisation of mica samples for spectrographic analysis has long been a problem <i>(2).</i> This technique was found to be very satisfactory.

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