Geochemical studies often require the separation of gram amounts of pure minerals from rocks. Hand picking is usually out of the question and one resorts to such well-known techniques as heavy liquid separation with bromoform, tetrabromoethane, or methylene iodide (Fairbairn, this journal, 1955), magnetic separation, (ibid. and Gaudin and Spedden, 1943; McAndrew, 1957; Rosenblum, 1958; Rubinstein et al., 1958) or to laboratory adaptation of industrial beneficiation processes like flotation or the Wilfley table. Many other techniques are used for particular problems: sieving, panning, various arrangements for elutriation with air or water, not to mention the old trick of shaking grains on a sheet of paper to recover flakes of mica.

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