Newsletter |
30,1 |
Location |
Miller Range |
Field Number |
18721 |
Dimensions (cm) |
5.0 x 3.0 x 1.5 |
Weight (g) |
25.61 |
Original Classification |
Howardite |
Updated Classification |
Eucrite (Brecciated) |
Pairing |
MIL 05062;
MIL 05085;
MIL 05165;
MIL 090640;
MIL 15428;
|
Ferrosilite (mol%): 30-60 |
B |
B |
30-40% brown/black fusion crust is on the exteriors with polygonal fractures. The interiors are tan to gray in color and are friable. No metal is visible. Black and white inclusions and odd shaped clasts of various colors are visible. |
The sections are so similar that a single description suffices. The sections show a groundmass of comminuted pyroxene and plagioclase (up to 0.5 mm) with fine- to coarse-grained basaltic clasts ranging up to 5 mm. Fine-grained clasts, presumably impact melt in origin, are observed. Most of the pyroxene is orthopyroxene and pigeonites with compositions ranging from Fs29-57Wo1-7, although augite of Fs40-60Wo24-40 is found. The Fe/Mn ratio is ~30 and feldspar is anorthitic (An90-92). The meteorites are howardites. |
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. |