[meteorite-list] Chondrule (Color) Question

[bernd.pauli at paulinet.de]

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