Since you all asked................ Here is a close-up of that chondrule, and I do believe it is a chondrule. _http://www.impactika.com/catpix/bplainex.jpg_ (http://www.impactika.com/catpix/bplainex.jpg) And Bernd, your estimate was very close, it is not quite round, so it is 15 mm across at the narrowest point and 17mm across at the widest. And Thank you Art Ehlmann for allowing me to present this great piece to the world! ;-) (BTW, it is for sale, as a fund-raiser for the Monnig Collection). Anne M. Black _http://www.impactika.com/_ (http://www.impactika.com/) [email protected]_ (mailto:[email protected]) Vice-President, I.M.C.A. Inc. _http://www.imca.cc/_ (http://www.imca.cc/) In a message dated 11/2/2011 8:46:37 AM Mountain Daylight Time, [email protected] writes: Mirko wrote:
"Wow, what a large chondrule in this Belle Plaine piece! How large is this chondrule?" Truly amazing! Thanks for sharing with us! Judging from the scale cube, I'd say: the diameter is about 16 mm thus making it a real "macrochondrule" according to J.C.Bridges and the late R. Hutchison: J.C. BRIDGES et al. (1997) A survey of clasts and large chondrules in ordinary chondrites (Meteoritics 32-3, 1997, 389): "The macrochondrules were classified on the criteria of having diameters prior to sectioning of > 5 mm and the same mineral chemistry and internal textures as normal-sized chondrules." Best wishes, Bernd ______________________________________________ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list [email protected] http://six.pairlist.net/mailman/listinfo/meteorite-list
