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Thank you, appreciate your insights. Julie >Are you analysing all your Fe as FeII or FeIII? In the latter case, this will >push the totals up a bit. At the end of the day you may have a mix of the two. >I'm fiddling around with garnets dominated by And-Grs and have >little problem (we >also use a JXA-733 but with Advanced Microbeam's set up). I would >not expect the >matrix corrections to be an issue. Just ensure that the standards >you are using >have sufficient of the element you are interested in. I use a range >of different >things and there isn't a grt in sight. > Cheers, > Malc. -- Dr. Julie Vry Senior Lecturer - Geology (metamorphic petrology) School of Earth Sciences Victoria University PO Box 600 Wellington, New Zealand phone, office: 64 4 463 6432 (please do NOT leave messages here) please leave messages at: 025 644 5598 fax 64 4 463 5186 email: [log in to unmask]