Sample Petrographic Description
Sample Number | LAR 12325 |
Newsletter | 36,2 |
Location | Larkman Nunatak |
Field Number | 23967 |
Dimensions (cm) | 7.4 x 6.0 x 3.0 |
Weight (g) | 263.90 |
Original Classification | LL Chondrite (Impt Melt) |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 29;Ferrosilite (mol%): 9-23 | |
Weathering | |
B | |
Fracturing | |
A/B | |
Macroscopic Description - Cecilia Satterwhite | |
The rough, uneven exterior is black in color. Some of the smoother areas are lighter or more grayish in color than the rougher areas. Very small patches of rough, black fusion crust are present. The interior matrix is dark gray with heavily weathered rusty areas and visible metal grains. | |
Thin Section Description (,2) - Cari Corrigan, Linda Welzenbach | |
The section consists dominantly of clasts with a fine-grained, melt-textured matrix of olivine and pyroxene (1-10 microns) with irregular blebs of metal, sulfide and fragments of mineral grains (200-300 micron grain size.) Clasts exhibit shock effects. Clasts of this texture exist throughout the section, with melt veins in between. One large sulfide bleb is about 2.5 mm. The mineral compositions are homogenous; olivine is Fa29 and pyroxene is Fs23. The meteorite is an impact melt breccia of an LL chondrite precursor. |
Antarctic Meteorite Images for Sample LAR 12325 | ||||
Lab Photo(s) : | ||||
![]() |
![]() |
![]() |
![]() |
|
![]() |
![]() |
![]() |
![]() |
Antarctic Meteorite Images for Sample LAR 12325 | ||||
Thin Section Photo(s) : | ||||
![]() |
![]() |
![]() |
||
![]() |
![]() |
![]() |
References for Sample LAR12325 | |
RELAB, , Reflectance Experiment Lab , catalogue of samples. |