Newsletter |
29,2 |
Location |
Miller Range |
Field Number |
18731 |
Dimensions (cm) |
3.0 x 1.5 x 2.5 |
Weight (g) |
18.65 |
Original Classification |
Howardite |
Updated Classification |
Eucrite (Brecciated) |
Pairing |
MIL 05062;
MIL 05085;
MIL 05165;
MIL 090640;
MIL 15428;
|
Ferrosilite (mol%): 27-60 |
B |
B |
Only 5% of the exterior has shiny black fusion crust. The interior is a gray and tan matrix with vugs and white, black, gray and tan clasts. |
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 2 mm. Impact melt glass, including melt spherules, is present. Pyroxene exhibits a broad range of compositions (Fs60Wo6 to Fs27Wo42) and many grains exhibit twinning. The Fe/Mn ratio of the pyroxene is ~30. Plagioclase is ~An88Or0.2. The meteorite is a howardite. |
MIL 05062 and MIL 05085 have high POEM (percentage of eucrite material) values, within the range of eucrites; MIL 05165, MIL 090640, and MIL 15428 have identical petrography to MIL 05062 and MIL 05085. Pairing: All five of these can be paired based on combination of terrestrial ages, find location, and petrographic textures. |