Ion-microprobe analyses of Li and B in topaz show a range of four orders of magnitude for Li and three orders of magnitude for B and vary as a function of association. Li (mean = 121 ppmw–parts per million by weight) and B (mean = 39 ppmw) are high in topaz from topaz rhyolites but low in pegmatites (mean Li = 1.4, B = 1.3 ppmw) and hydrothermal greisens (mean Li = 1.0, B = 1.5 ppmw). A suggestion that high Li and B in topaz are related to an igneous origin is supported by high Li and B in topaz in topazite and ongonite dikes and very low Li and B in topaz from a hydrothermal topazite.

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