Newsletter |
31,2 |
Location |
Larkman Nunatak |
Field Number |
19936 |
Dimensions (cm) |
2.5 x 1.5 x 1.75 |
Weight (g) |
21.06 |
Original Classification |
LL3 Chondrite |
Updated 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;
|
Fayalite (mol%): 19-30;Ferrosilite (mol%): 13-24 |
B |
A/B |
The exteriors of these paired meteorites are covered with brown/black smooth fusion crust. The interiors are a rusty black to gray color with high metal content and chondrules of various sizes and colors. |
The sections exhibit numerous large (up to 2 mm), well-defined chondrules in a dark matrix of fine-grained silicates, metal and troilite. Polysynthetically twinned pyroxene is abundant. The meteorites are lightly weathered. Silicates are unequilibrated; olivines range from Fa8-40, with a large peak at Fa28-30, and pyroxenes from Fs14-24. The meteorites are LL3 chondrites, probably of subtype ~3.8. |
Classification updated to LL3.8 as announced in AMN 31 no. 2. |
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. |