Doug kindly wrote: "Just a click away and an interested person without the materials and microscope can vicariously participate with Bernd's clear and colorful image of his nice thin section of Lodranite/Acapulcoite material."
Thank you, Doug. Much appreciated! Yes, that's one of my best pics that I've taken so far in cross-polarized light and still without a gadget to firmly attach the camera to the microscope, camera only hand-held! Doug: "Bernd, could you kindly mention which of the grains were measured for those of us who want to confirm our little fun with a tape measure on our computer screens?" I could but I won't ;-) Let me explain my rudeness: You have the field of view in the upper right corner, so it's easy to figure out the rest - an easy exercise! Doug quoting from C. Floss: "The simple bimodal classification of these meteorites based primarily on petrographic criteria, which has been used to date, appears to be inadequate to describe this diverse group of samples, ..." Hence I wrote and also quoted on Friday, Oct 26: ----------------------------------------------------------------------------------------- But: It is not only grain size! ... and that's why this excerpt from an article in MAPS may be of interest in this context: TERRIBILINI D. et al. (2000) Evidence for common breakup events of the acapulcoites-lodranites and chondrites (MAPS 35-5, 2000, pp. 1043-1050). "GRA 95209 is considered a lodranite based on petrography (McCoy and Carlson, 1998), but Mittlefehldt and Lindstrom (1998) find that the bulk-rock composition is more similar to acapulcoites and quite different from that of lodranites. Thus, a clear-cut classification is difficult." ----------------------------------------------------------------------------------------- Best wishes, Bernd ______________________________________________ Meteorite-list mailing list [email protected] http://six.pairlist.net/mailman/listinfo/meteorite-list
