Name: Elephant Moraine 99407 This is an OFFICIAL meteorite name. Abbreviation: EET 99407 Observed fall: No Year found: 1999 Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)] Mass: 60 g
Macroscopic Description: Kathleen McBride Both of these meteorites' exterior surfaces are rough, black and granular in appearance. EET99407 has some gray-black fusion crust. The interiors have a granular crystalline texture that is somewhat friable. The matrix is gray to black in color with dark gray crystalline mineral grains cemented by fine rusty material. Some areas appear like they've been melted together.
Thin Section (, 6;, 4) Description: Tim McCoy
EET99402
EET99407
These meteorites are so similar that a single description suffices. The sections are composed dominantly of equant olivine (Fa35; 0.2-1.5 mm in diameter) with 120ยบ triple junctions. Calcic pyroxene (Fs10-12; Wo43-46) and plagioclase (An38-40; Or0.1-0.3) comprise a few percent of the meteorite each and are heterogeneously distributed. Minor chromite and iron sulfides are also present. The rocks are moderately shocked, with planar fractures in olivine and mosaicism in feldspar. The meteorites are probably brachinites.
Oxygen Isotope analysis: T.K.Mayeda and R.N.Clayton. Our analysis for EET 99402 gives: delta-18=+3.57, delta-17=+1.65. This is indistinguishable from Brachina, for which the values are: +3.48, +1.61 (Clayton and Mayeda, 1996).
60 g
