Modern electron microprobe instrumentation makes possible the precise analysis of O. However, the lack of standards for which O contents are measured has hindered accurate calibration ofO on the microprobe and prohibited rigorous evaluation of the accuracy of O analyses. Samples ofalbite, almandine, biotite, corundum, dolomite, enstatite, forsterite, gahnite, hematite, kaersutite, muscovite, quattz, and sillimanite have been characterized for this purpose, including measurement of O content by fast neutron activation analysis. These standards are now available for use in calibrating the electron microprobe for analysis of O.

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