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1 results

  • An ultrasonic probe for the extraction of microscopic quantities of minerals for X-ray work

  • Veselin Kovachev, Strashimir Strashimirov
  • Journal:
    Mineralogical Magazine / Volume 60 / Issue 402 / October 1996
    Published online by Cambridge University Press:
    05 July 2018, pp. 829-831

  • The instrumentation and procedure is described for the extraction of very small and pure samples from polished mounts and thin sections of minerals, for X-ray analysis and other micro-analytical techniques. It uses a stand-mounted, tunable ultrasonic probe (400 W/15–50 kHz) inclined at 45°C to a microscope stage. The tip of the probe, usually a steel needle, is located on the desired mineral and an appropriate ultrasonic frequency is selected. Very fine powders are produced from grains as small as 0.01–0.005 mm. A distinct advantage of this technique is that, as different minerals powder at different rates and different frequencies, it is possible to separate a single mineral from an intergrowth of two or more minerals.