Name: Grosvenor Mountains 95551 This is an OFFICIAL meteorite name. Abbreviation: GRO 95551 Observed fall: No Year found: 1995 Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)] Mass: 213 g
Macroscopic Description: Kathleen McBride The exterior of this unusual meteorite has thin patches of black fusion crust. Most of the surface has a rusty brown melted appearance with exposed clasts. The clasts are large, rounded and greenish-white with coarse crystalline textures. The interior is rusty and heavily weathered. A variety of inclusions are visible, some are black, very fine-grained and angular. There are a number of rounded objects less then 2-3 mm that could be chondrules. One large clast is greenish-yellow in color, others are rusty. This metorite was very coherent and difficult to break.
Thin Section (,2,11,13,15) Description: Brian Mason The sections show a breccia of two types of clasts, chondritic and achondritic. The chondritic clasts range up to 15+ mm, and consist of a variety of chondrules and chondrule fragments (up to 1.8 mm across) in a matrix of nickel-iron with minor troilite. Microprobe analyses of the chondrules gave the following compositions: olivine, Fa1-2; pyroxene, Fs1, with a few more iron-rich grains. The nickel-iron contains no silicon. The achondritic clasts are up to 11 mm across and consist of highly-shocked enstatite (or clinoenstatite). GRO 95551,15 contains a fine-grained carbonaceous clast, 3.6 mm across. The meteorite is anomalous, and resembles Bencubbin (Geochim. Cosmochim. Acta, v.42, p.507, 1978) and Weatherford (Geochim, Cosmochim, Acta, v.32, p.661, 1968).