Crushing and sieving,select two sieves and clean them thoroughly with a brush and a dissecting needle. the goal is to eliminate polymineralic grains, so the coarser sieve should have openings somewhat smaller than the average crystal size in the rock. use a 0.5 or 0.25 mm screen for the finer sieve. for coarse granite samples, used 1.0 mm and 0.25 mm screens.
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