EXTREME Pu-U AND POSSIBLE Pu-REE FRACTIONATION IN UNEQUILIBRATED CHO ND RITES

In the abstracts of the 44th Annual Meeting of the Meteoritical Society a new stony-iron meteorite found at Penwell near Odessa, Ector County, Texas was reported. This meteorite was characterized by a high concentration of cliftonite graphite. Additional study of this meteorite shows that the non-metallic phases are similar to those found in silicate inclusions of the Odessa iron meteorite. Table I compares the analysis of some minerals from Penwell with those reported for Odessa and those analyzed in samples identified as PseudoPenwell. Pseudo-Penwell is a sample of several stones collected after Penwell was first reported. It was made available to us by James DuPont. The original Penwell and the Pseudo-Penwell have different macroscopic and microscopic characteristics. Penwell appears to be more coarsely crystalline with a granoblastic texture than Pseudo-Penwell or Odessa silicate inclusions.