Sample Petrographic Description
Sample Number | LAR 12180 |
Newsletter | 38,2 |
Location | Larkman Nunatak |
Field Number | 23131 |
Dimensions (cm) | 3.1 x 2.7 x 1.2 |
Weight (g) | 20.07 |
Original Classification | LL3.8 Chondrite |
Pairing | LAR 06279; LAR 06283; LAR 06301; LAR 06320; LAR 06343; LAR 06469; LAR 06674; LAR 06772; LAR 06774; LAR 12034; LAR 12075; LAR 12078; LAR 12180; LAR 12203; |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 4-27;Ferrosilite (mol%): 19 | |
Weathering | |
B/C | |
Fracturing | |
A/B | |
Macroscopic Description - Cecilia Satterwhite | |
The exterior is covered with 80% black fusion crust. Some areas are weathered brown with visible chondrules. The interior is heavily weathered with some dark gray to black matrix visible. The visible chondrules/inclusions are weathered. | |
Thin Section Description (,2) - Cari Corrigan, Tim McCoy | |
The section exhibits numerous well-defined chondrules (up to 1 mm) in a matrix of fine-grained silicates, metal and troilite. Polysynthetically twinned pyroxene is abundant. The meteorite is modestly stained with hydrated iron oxides of terrestrial origin. Silicates are unequilibrated; olivines range from Fa4-27 and a pyroxene is Fs19. The meteorite is an LL3 chondrite (estimated subtype 3.8). | |
Notes | |
There are 14 LL3.8 chondrites that were recovered from a small area within the LAR dense collection area. These were announced in earlier newsletters and were not all paired with each other. Inspection of the field map for all these samples indicates they were recovered within 1 km of each other, and likely all paired together. Since they were classified and announced in small batches and over an 8 year period, they were not recognized as pairs until some time had passed. These include LAR from the 06 season 279, 283, 301, 320, 343, 469, 674, 772, 774, and from the 12 season 034, 075, 078, 180 and 203. |
Antarctic Meteorite Images for Sample LAR 12180 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample LAR 12180 | ||||
Thin Section Photo(s) : | ||||