JEOL Probe Users Listserver Moderator: Ellery Frahm, [log in to unmask], Electron Microprobe Lab, University of Minnesota Post a message: send your message to [log in to unmask] Unsubscribe: send "SIGNOFF PROBEUSERS" to [log in to unmask] On-line help and FAQ: http://probelab.geo.umn.edu/listserver.html * Dear Eric, Thanks. I had not noticed significant beam damage in my apatites, but then I'm a (very) modest user of the probe. I do usually try and use as large a spot size as possible. Some phosphates are significantly degraded under the beam no matter how careful you are. Henry Henry Barwood Associate Professor of Science, Earth Sciences Department of Math and Physics MSCX 312G Troy University Troy, Alabama [log in to unmask] _____ From: JEOL-Focused Probe Users List [mailto:[log in to unmask]] On Behalf Of Eric J Essene 1 Sent: Wednesday, September 06, 2006 12:02 PM To: [log in to unmask] Subject: Re: [PROBE-USERS] Help with probe analysis of minerals Henry, Microprobe analysis of both the apatite- and bastnaesite-group phases is quite touchy. Beam damage, degassing and elemental migration (potential F and Cl increase in apatite with time) are significant problems for these minerals. eric On Sep 6, 2006, at 11:52 AM, Henry Barwood wrote: JEOL Probe Users Listserver Moderator: Ellery Frahm, [log in to unmask], Electron Microprobe Lab, University of Minnesota Post a message: send your message to [log in to unmask] Unsubscribe: send "SIGNOFF PROBEUSERS" to [log in to unmask] On-line help and FAQ: http://probelab.geo.umn.edu/listserver.html * Perhaps someone on the list would be interested in collaborating with me on the analysis of some mineral specimens for publication. I have been conducting studies of syenite minerals from the Arkansas alkalic syenites for over 20 years and would like to work on some of the accumulation of unknowns that has built up. Unfortunately, here at Troy, my research capabilities are somewhat limited. If there is anyone who would like to analyze some of the specimens as a co-author, please let me know. Some of the partially completed studies that I have waiting include: Analysis of brithiolite and silician fluorapatites Mosandrite analysis Examination of the eudialites from Magnet Cove and Jones Mills Reexamination of the rare-earth fluorocarbonates from several locations Thanks. Henry Barwood Associate Professor of Science, Earth Sciences Department of Math and Physics MSCX 312G Troy University Troy, Alabama [log in to unmask]