Name: Grosvenor Mountains 95658 This is an OFFICIAL meteorite name. Abbreviation: GRO 95658 Observed fall: No Year found: 1995 Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)] Mass: 57.6 g
Macroscopic Description: Kathleen McBride The exterior of this ordinary chondrite has dull black fusion crust over 60% of its surface. This fusion crust is striated and rough, with visible bubbles. The interior has a black matrix. Numerous, large (largest ~0.5 cm in diameter) tan and rust colored chondrules and metal grains are present.
Thin Section (,2) Description: Brian Mason The section shows a close-packed aggregate of chondrules, chondrule fragments and irregular aggregates up to 1.8 mm across, in a small amount of black matrix which contains accessory nickel-iron and sulfide in minute grains. A variety of chondrules are present, including barred olivine, granular and porphyritic olivine and olivine-pyroxene, and radiating and cryptocrystalline pyroxene. Microprobe analyses show olivine and pyroxene of variable compositions; olivine, Fa6-28, mean Fa18; pyroxene, Fs2-21. The meteorite is tentatively classified as an LL3 chondrite (estimated LL3.3).