1. A PROCESS FOR THE PRODUCTION OF HIGH-PURITY SPONDUMENE CONCENTRATES AND THE ISOLATION OF SPODUMENE FROM BERYL FROM A MIXTURE CONTAINING THE SAME, WHICH COMPRISES THE STEPS OF COMMINUTING THE MIXTURE TO FORM A MATERIAL OF RELATIVELY FINELY DIVIDED STATE, FORMING A PULP OF THE FINELY DIVIDED MATERIAL WITH AQUEOUS LIQUID, FILMING THE BERYL AND SPONDUMENE SELECTIVELY AT A PH OF 6.5 TO 9.0 IN THE PRESENCE OF (1), A DISPERSING AND RETARDING AGENT (A+B), WHEREIN A IS A NUMBER OF THE CLASS CONSISTING OF SODIUM FLUORIDE, STARCH, QUEBRACHO, SODIUM SULFIDE AND A MIXTURE OF SODIUM FLUORIDE WITH A MEMBER OF THE CLASS CONSISTING OF STARCH, QUEBRACHO AND SODIUM SULFIDE; AND ! IS A MEMBER OF THE CLASS CONSISTING OF A LIGNIN SULFONATE, STARCH, QUEBRACHO, SODIUM; AND A MIXTURE OF LIGNIN SULFONATE WITH A MEMBER OF THE CLASS CONSISTING OF STARCH QUEBRACHO AND SODIUM SULFIDE; AND (2) A FATTY ACID FLOTATION AGENT WHEREBY SAID SPONDUMENE EXHIBITS A LESSER TENDENCY TO BECOME COATED WITH FILM THAN THE BERYL, FROTHING THE PULP WITH AIR SO THAT THE BERYL IS DEPRESSED AND THE SPODUMENE IS FLOATED IN THE FROTH, AND COLLECTING THE FROTH CONTAINING THE SPODUMENE.