Antarctic Search for Meteorites (ANSMET) Search this
Place:
Antarctica
Collection Date:
2009
Notes:
# NASA data for MIL 090346 Weathering: B Fracturing: A Pairing: MIL 07099 Fa: 2-38 mol % Fs: 1-4 mol %
These carbonaceous chondrites have varying amounts (20-100%) of brown/black fusion crust with oxidation haloes and rusty areas. Some exterior surfaces are pitted. The interiors of these meteorites range in color from brown to dark gray to black. Most have a fine-grained matrix with light colored inclusions.
These sections are so similar that a single description suffices. The sections consist of abundant (up to 1 mm) chondrules, chondrule fragments and mineral grains in a dark matrix. Metal and sulfide occur within and rimming the chondrules. Glass within chondrules appears to be very clear/fresh. CAIs are abundant in many sections (mostly Type A), and range in size up to 1 mm, many containing blue hibonite grains. At least one compound CAI was found. AOAs up to 1 mm exist, as well. Olivine ranges in composition from Fa₀₋₈₀. Pyroxene analyses range from Fs₀₋₄₄ (most from Fs₀₋₁₃). These meteorites are somewhat terrestrially altered. They are CO3 chondrites (likely type 3.0-3.2) and are probably members of the MIL 07099 pairing group.
