Matteo wonders: "H chondrite? ... strange ...similar to ... L chondrite"
Hello Matteo, Jeff G. and List, That's why I wrote this on Sun Oct 07-2007 with regard to the thin section pictures you can view here (it was Sterling who posted the link) : http://www.ingemmet.gob.pe/paginas/pl01_quienes_somos.aspx?opcion=320 "... there is a "conglomerate" of what may have been one or several large BO chondrules (chondrule fragments). This causes a bit of a headache because, if this is or was a large BO chondrule, I wouldn't rule out an L chondrite as H chondrites *tend* to have smaller chondrules!" But I was careful and wrote "H chondrites *tend* to have smaller chondrules". One of my Carancas specimens has a beautiful 0.7 mm chondrule protruding completely from the surrounding matrix - large enough to consider it an L chondrite. But: Chondrule size is not the only criterion! These Fa and Fs values below definitely place Carancas in the realm of the H chondrites: Olivine (Fa18.4±0.5) and pyroxene (Fs16.1±0.2) Some examples with (almost) identical Fa and Fs values: DaG 016 (H5) - DaG 299 (H4) - Dhofar 834 (H4) - Round Top (b) (H4) Carancasically, Bernd ______________________________________________ http://www.meteoritecentral.com Meteorite-list mailing list [email protected] http://six.pairlist.net/mailman/listinfo/meteorite-list
