Laboratory Methods for the Separation and Purification of Mineral Samples
Keywords:
gravimetric, magnetism, disolution, electrostaticAbstract
A description is given of common methods for separating pure mineral species from mixtures. The methods described include gravimetric, magnetic, chemical (by dissolving the accompanying minerals), flotation, electrostatic, and hand selection methods. The concentration of the highest purity is achieved with the latter, usually under a stereoscopic microscope using a needle with a handle. Those who practice this method generally have a personal preferred technique, sometimes quite peculiar. The author describes their own method, which consists of lightly touching the nose with the tip of the needle, allowing the mineral grains to easily adhere to it.
Abstract from:
Gómez-Caballero, J. A. (2005). Historia e índice comentado del Boletín del Instituto de Geología de la UNAM. Boletín de la Sociedad Geológica Mexicana: Volumen Conmemorativo del Centenario Aspectos históricos de la Geología Mexicana, 57I(2), 149-185. http://dx.doi.org/10.18268/BSGM2005v57n2a3
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