Dave Harris wrote: >I am sure I saw some reference on the list about >these Nantan thin sections that appear on Fleabay. >Having just got a polarizing scope I just realised >that they can either be ruut t/s or completely >opaque as Fe and sulphides are opaque to the >standard 30 micron thickness, and would be a >bit dull anyway - expecially looking at rust! >How funny - shows I learnt SOMETHING already >about mineral optics
There are petrographic microscopes, which use reflected polarized light to conduct petrographic analysis of opaque minerals in polished thin sections. To take advantage of reflected light petrography, the thin sections usually have to be polished. Determination of opaque minerals in reflected light microscopy http://www.unige.ch/sciences/terre/mineral/fontbote/opaques/opaques_properties.html Ore Petrology and Phase Equilibria http://www.agu.org/revgeophys/mckibb01/node11.html Ore (Petrographic) Microscopes http://www.oremicroscopes.com/ Trinocular Ore Polarizing Petrographic Microscope http://usbmicroscopes.biz/usb-microscope/trinocular-ore-polarizing-petrographic-microscope/ A couple of books: Ore Microscopy and Ore Petrography by James R. Craig and David J. Vaughan (1994), ISBN:0471551759 Atlas of the Textural Patterns of Ore Minerals and Metallogenic Processes by S. S. Augustithis (1995) ISBN:3110136392 Bunch, T. E. and A. M. Reid, 1975, The Nakhlites. I - Petrography and mineral chemistry. Meteoritics. vol. 10, pp. 303-315, pp. 317-324. Yours, Paul H. ______________________________________________ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
