Walter wrote: "Thanks Michael - thank you Andi and John" Yes, thanks a lot ... that's a beautiful barred olivine chondrule!
"Okay, I admit I know nothing about thin sections. Someone educate me." Woe, it's me, shame and scandal in the family ... :-)) "What are the vertical pieces that sort of remind me of mitochondria in a cell?" These worm-like or larva-like features are olivine bars - hence BO chondrule, barred olivine chondrule. Well, a similar picture can be seen in O.R. Norton's Cambridge Encyclopedia, page 113. "What does the horizontal color gradient indicate?" This may indicate three things: 1) in accordance with what O.R. Norton says on p. 113, the rim and the bars on the right are not in optical continuity (not oriented identically); 2) the bars and the rim on the left are chemically somewhat different, probably richer in iron than the yellow-orange crystals on the right; 3) the thin section does not have a uniform thickness. (1) and (3) are improbable as both bars and rim seem to be oriented identically (north - south in the picture), so my guess is that the color gradient indicates chemical composition as explained in (2). Best TS wishes, Bernd ______________________________________________ Meteorite-list mailing list [email protected] http://six.pairlist.net/mailman/listinfo/meteorite-list
