Techniques for the preparation of surfaces for microscopic examination are described in detail with the results shown by photomicrographs. Equipment and materials required, together with the methods of preparing the equipment, are discussed.Specimens of ores and liberated grains may be mounted in any of several different media: (1) conventional bakelite or diallyl phthalate resins using heat and pressure curing; (2) room temperature curing plastic resins; or (3) epoxy resins.The polishing procedure involves 5 steps: (1) grinding, (2) impregnation, (3) rough polishing with diamond abrasive, (4) vibratory polishing with 0.3 micron Al 2 O 3 (Linde A), and (5) final polishing with 0.05-0.1 micron Al 2 O 3 (Linde B).This general procedure may be used for ores and liberated grain concentrates to produce polished sections with minimum relief between phases of all hardnesses. The method is recommended for preparation of specimens for election microprobe analysis.

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