Hi Maria, Hello Mark and List, Maria wrote:
> I am wondering why this particular chondrule > weathered to a pinkish color. Mark responded: > Just the right weathering conditions for the rusting > iron to permeate the chondrule and discolor it. Maybe it is a porphyritic pyroxene chondrule where pyroxene crystals are surrounded by p i n k i s h Ca-free or low-Ca feldspathic glass as has been abundantly preserved in "PP" (porphyritic pyroxene) chondrules in the Korra Korrabes H3 chondrite. Reference: ASHWAL L.D. (2001) Korra Korrabes: A new, large H3 chondrite breccia from Namibia (MAPS 36-8, 2001, pp. 1027-1038). On page 1038, the author states: "Ca-deficient glasses, in some cases pink in color, have been reported in Krähenberg (LL5), Parnallee (LL3.6) and Yamato 74191 (L3), although their compositions are not as alkaline as those observed in Korra Korrabes." Pink glass was also observed in a few chondrules of the Olton (H3-4) chondrite [KEIL K. et al. (1990) The Olton, Texas, H chondrite regolith breccia: Paired with Dimmitt (Meteoritics 25-4, 1990, 259-261)]. Best Sunday Wishes from Germany, Bernd ______________________________________________ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
