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MANY important silicate minerals, in particular pyroxenes, amphiboles, garnets, and epidote, have densities above 3.3 gm/em 3 and below 4.3 gm/em 3. Separation of these minerals cannot be carried out withdoi:10.1180/minmag.1963.033.263.10 fatcat:sd7z7gr5krhljnyztu3lvfrc4q