Hello again, I just studied my Estacado thin section (that I purchased from AL Mitterling in 1999) under crossed polars and compared the extinction behavior of its olivine crystals to the description given in A. Rubin's paper: " ... olivine in Spade currently exhibits undulose extinction and lacks planar fractures, characteristic of shock stage S2."
The olivine grains in my Estacado thin section exhibit sharp optical extinction which is consistent with shock-stage S1, and Estacado has been assigned a shock stage of S1 (see also Matt's comment). This result would preclude a possible pairing of Spade and Estacado. Bernd ______________________________________________ Meteorite-list mailing list [EMAIL PROTECTED] http://www.pairlist.net/mailman/listinfo/meteorite-list
