The search for rare elements in pegmatites can be facilitated by applying chemical, physical, and mineralogical associations to the selection of a suitable test mineral which then may be expected to give clues as to the presence or absence of the rare element in the pegmatite. The characteristics and functions of certain test minerals are described.The rare earths, columbium and tantalum, vanadium, and the rare alkalies are discussed with these points in mind.

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