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 Kr�henberg (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 [email protected] http://six.pairlist.net/mailman/listinfo/meteorite-list
