Newsletter |
31,2 |
Location |
Miller Range |
Field Number |
18625 |
Dimensions (cm) |
2.5 x 1.5 x 1.5 |
Weight (g) |
12.25 |
Original Classification |
Howardite |
Updated Classification |
Eucrite (Brecciated) |
Fayalite (mol%): 0;Ferrosilite (mol%): 25-60 |
A/B |
A/B |
Macroscopic Description: Kathleen McBride
99% of the exterior is covered with shiny black fusion crust. Oxidation halos are visible on one side. The interior is a light gray matrix with tiny white and black inclusions (
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Thin Section (,4) Description: Tim McCoy, Linda Welzenbach, Cari Corrigan and Rhiannon Mayne
The section shows a groundmass of comminuted pyroxene and plagioclase (up to 0.5 mm) with fine- to coarse-grained basaltic clasts ranging up to 5 mm. A few large, but highly weathered, metal and sulfide particles are present. Pyroxene compositions range from Fs25-60Wo4-44. Plagioclase composition is An84-89. The meteorite is probably a howardite, although the large metal-sulfide particles could suggest an origin as a silicate clast from a mesosiderite. |
MIL 07009 has a high POEM (percentage of eucrite material) value ~ 90, within the range of eucrites.
Welten, K. et al. (2024) Terrestrial Ages and pairing of HEDs from the Miller Range Icefields, Antarctica. LPSC abstract. 55th Lunar and Planetary Science Conference, #1295. |