Sample Petrographic Description
Sample Number | LAR 12326 |
Newsletter | 36,2 |
Location | Larkman Nunatak |
Field Number | 23915 |
Dimensions (cm) | 25.0 x 20.0 x 15.0 |
Weight (g) | 10445.00 |
Original Classification | Howardite |
Mineral Composition (%Fa & %Fs) | |
Ferrosilite (mol%): 32-52 | |
Weathering | |
B | |
Fracturing | |
B | |
Macroscopic Description - Kathleen McBride | |
The exterior of this breccia has a coarse to fined grained texture with multiple types of clasts, ranging in color from white to dark gray. Approximately 40% of the exterior surface has brown/black fusion crust and visible shock veins. The interior looks the same as the exterior but is less weathered. | |
Thin Section Description (,2) - Cari Corrigan, Linda Welzenbach | |
The section shows a groundmass of comminuted pyroxene and plagioclase (up to 0.5 mm) with coarse-grained diogenitic clasts up to 5 mm. Groundmass is heavily shocked. Pyroxene compositions range from Fs32-52Wo2-25. No olivine grains were found. This section is from a large, very brecciated howardite and this description may not be representative of the whole (since compositions here are essentially eucritic). | |
Astromaterials 3D Link(s) | |
https://ares.jsc.nasa.gov/astromaterials3d/sample-details.htm?sample=LAR12326-32 |
Antarctic Meteorite Images for Sample LAR 12326 | ||||
Lab Photo(s) : | ||||
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Antarctic Meteorite Images for Sample LAR 12326 | ||||
Thin Section Photo(s) : | ||||
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References for Sample LAR12326 | |
RELAB, , Reflectance Experiment Lab , catalogue of samples. |