Name: Meteorite Hills 00422 This is an OFFICIAL meteorite name. Abbreviation: MET 00422 Observed fall: No Year found: 2000 Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)] Mass: 202 g
Macroscopic Description: Kathleen McBride
40% of the exterior of this meteorite is covered with a chocolate brown fusion crust. This crust is patchy and displays polygonal fractures. The exposed interior is gray and tan and has dark colored, crystalline clasts. The interior is mostly gray matrix with some areas of tan colored grains. This rock contains numerous euhedral clasts of various colors - black, green, white, yellow, and is moderately soft.
Thin Section (,2) Description: Tim McCoy and Linda Welzenbach
The section shows a groundmass of highly comminuted pyroxene, with the largest grain reaching 1.8 mm. Orthopyroxene has a composition of Fs22Wo1-2. The Fe/Mn ratio of the pyroxene is ~30. The meteorite is a diogenite.