Volume 46 No. 1 – March 2023
Table 1. Newly Classified Antarctic Meteorites
| Sample Number | Weight (g) | Classification | Weathering |
Fracturing |
%Fa |
%Fs |
Magnetic Susceptibility | |
|---|---|---|---|---|---|---|---|---|
| DOM 18048 | 55.0 | H6 CHONDRITE | B/Ce | B/C | 19 | 17 | 5.040 | |
| DOM 18049 | 45.3 | L6 CHONDRITE | B | B | 24 | 4.680 | ||
| DOM 18200 | 30.0 | H5 CHONDRITE | B | B | 18 | 16 | 4.970 | |
| DOM 18201 | 17.4 | L5 CHONDRITE | Be | A/B | 24 | 4.640 | ||
| DOM 18202 | 30.6 | H5 CHONDRITE | Be | B | 19 | 5.020 | ||
| DOM 18203 | 14.1 | L6 CHONDRITE | A/B | B/C | 24 | 4.460 | ||
| DOM 18204 | 12.2 | L6 CHONDRITE | B/C | B/C | 25 | 4.640 | ||
| DOM 18206 | 6.9 | L6 CHONDRITE | B/Ce | B/C | 24 | 21 | 4.020 | |
| DOM 18207 | 11.4 | L5 CHONDRITE | B/C | A/B | 24 | 4.560 | ||
| DOM 18208 | 14.6 | L6 CHONDRITE | B/C | B/C | 24 | 20 | 4.610 | |
| DOM 18209 | 8.5 | L5 CHONDRITE | B | A/B | 24 | 21 | 4.730 | |
| DOM 18230 | 40.0 | H6 CHONDRITE | B/C | B | 19 | 17 | 5.090 | |
| DOM 18231 | 43.4 | L5 CHONDRITE | B | A | 24 | 21 | 4.490 | |
| DOM 18232 | 55.6 | H6 CHONDRITE | B/C | A/B | 19 | 17 | 5.080 | |
| DOM 18233 | 28.2 | H6 CHONDRITE | B/C | A/B | 19 | 17 | 5.020 | |
| DOM 18234 | 43.4 | H6 CHONDRITE | B/C | A/B | 18 | 5.310 | ||
| DOM 18235 | 53.6 | H6 CHONDRITE | B/C | A/B | 19 | 17 | 5.070 | |
| DOM 18236 | 75.1 | H5 CHONDRITE | B/C | A | 19 | 17 | 5.000 | |
| DOM 18237 | 67.7 | L5 CHONDRITE | Be | A | 24 | 20 | 4.710 | |
| DOM 18238 | 34.9 | L5 CHONDRITE | B | A | 24 | 21 | 4.590 | |
| DOM 18239 | 85.9 | L5 CHONDRITE | B | A/B | 24 | 21 | 4.710 | |
| DOM 18240 | 56.8 | H5 CHONDRITE | B/Ce | A/B | 19 | 16 | 5.220 | |
| DOM 18241 | 41.2 | L5 CHONDRITE | B | B | 24 | 20 | 4.650 | |
| DOM 18243 | 32.0 | H5 CHONDRITE | B/C | B | 18 | 16 | 5.060 | |
| DOM 18245 | 96.0 | L6 CHONDRITE | Be | B/C | 25 | 21 | 4.220 | |
| DOM 18246 | 66.7 | H6 CHONDRITE | B/C | A/B | 19 | 17 | 5.080 | |
| DOM 18247 | 52.2 | H6 CHONDRITE | B/C | A/B | 19 | 17 | 5.120 | |
| DOM 18248 | 51.0 | L5 CHONDRITE | B/C | B/C | 24 | 20 | 4.760 | |
| DOM 18249 | 62.7 | H5 CHONDRITE | B | B | 17 | 16 | 5.080 | |
| DOM 18250 | 47.1 | L5 CHONDRITE | Be | B/C | 24 | 21 | 4.620 | |
| DOM 18251 | 34.3 | L6 CHONDRITE | B | A/B | 24 | 21 | 4.770 | |
| DOM 18252 | 72.5 | L5 CHONDRITE | B/Ce | B/C | 24 | 21 | 4.640 | |
| DOM 18253 | 61.2 | L4 CHONDRITE | B/Ce | B/C | 24 | 21 | 4.680 | |
| DOM 18254 | 46.1 | H6 CHONDRITE | B/C | B | 19 | 17 | 5.100 | |
| DOM 18256 | 40.2 | L5 CHONDRITE | B | B/C | 24 | 20 | 4.630 | |
| DOM 18257 | 60.7 | H4 CHONDRITE | B/C | B | 18 | 16 | 5.030 | |
| DOM 18258 | 18.4 | L5 CHONDRITE | B/C | B | 24 | 21 | 4.540 | |
| DOM 18259 | 9.7 | L6 CHONDRITE | B/Ce | B | 24 | 21 | 4.570 | |
| DOM 18260 | 49.6 | L5 CHONDRITE | B | B/C | 25 | 21 | 4.530 | |
| DOM 18261 | 41.0 | H5 CHONDRITE | B/C | A/B | 19 | 17 | 4.950 | |
| DOM 18263 | 32.5 | H5 CHONDRITE | B | B | 19 | 17 | 4.980 | |
| DOM 18264 | 32.4 | L5 CHONDRITE | B | B/C | 25 | 22 | 4.560 | |
| DOM 18265 | 36.1 | H6 CHONDRITE | B/C | B/C | 20 | 17 | 4.960 | |
| DOM 18266 | 34.2 | L5 CHONDRITE | Be | A/B | 25 | 21 | 4.640 | |
| DOM 18267 | 61.0 | LL5 CHONDRITE | B/C | B | 28 | 26 | 4.550 | |
| DOM 18268 | 30.8 | H6 CHONDRITE | B/C | A/B | 20 | 18 | 5.030 | |
| DOM 18269 | 99.2 | IRON-UNGROUPED | B | A | 5.380 | |||
| DOM 18280 | 21.0 | L5 CHONDRITE | B/Ce | B | 25 | 20 | 4.570 | |
| DOM 18281 | 59.8 | L5 CHONDRITE | B/C | B | 24 | 21 | 4.730 | |
| DOM 18282 | 35.2 | H6 CHONDRITE | B/Ce | B/C | 19 | 17 | 4.940 | |
| DOM 18283 | 40.2 | L5 CHONDRITE | B/Ce | B/C | 25 | 21 | 4.540 | |
| DOM 18284 | 28.5 | H5 CHONDRITE | B/Ce | B | 20 | 18 | 4.910 | |
| DOM 18285 | 37.8 | H6 CHONDRITE | B/Ce | B | 19 | 17 | 4.900 | |
| DOM 18287 | 46.5 | H4 CHONDRITE | B/C | B | 19 | 17 | 4.870 | |
| DOM 18288 | 63.9 | H4 CHONDRITE | B | B | 19 | 17 | 5.080 | |
| DOM 18289 | 23.0 | L5 CHONDRITE | B/C | B | 25 | 20 | 5.010 | |
| DOM 18300 | 11.1 | L6 CHONDRITE | B/Ce | B | 26 | 24 | 4.270 | |
| DOM 18301 | 10.0 | H5 CHONDRITE | B/Ce | B | 20 | 17 | 4.940 | |
| DOM 18302 | 11.5 | H6 CHONDRITE | B/C | B | 19 | 17 | 4.960 | |
| DOM 18305 | 30.9 | H5 CHONDRITE | B/Ce | A/B | 19 | 17 | 4.960 | |
| DOM 18306 | 15.4 | L6 CHONDRITE | B/Ce | A/B | 25 | 21 | 4.130 | |
| DOM 18307 | 11.3 | H6 CHONDRITE | B/C | B/C | 20 | 17 | 4.890 | |
| DOM 18308 | 13.9 | L6 CHONDRITE | B/C | B | 26 | 4.870 | ||
| DOM 18309 | 24.5 | H6 CHONDRITE | B/Ce | B/C | 20 | 4.900 | ||
| DOM 18340 | 8.9 | L6 CHONDRITE | B/C | A/B | 26 | 22 | 4.810 | |
| DOM 18341 | 7.3 | L6 CHONDRITE | Be | A/B | 26 | 22 | 4.520 | |
| DOM 18342 | 7.6 | H6 CHONDRITE | B/Ce | A | 19 | 17 | 4.940 | |
| DOM 18343 | 27.0 | L5 CHONDRITE | B/Ce | A | 25 | 21 | 4.590 | |
| DOM 18344 | 5.7 | L6 CHONDRITE | B | A/B | 25 | 21 | 4.740 | |
| DOM 18345 | 9.8 | H6 CHONDRITE | B/Ce | A | 20 | 17 | 4.930 | |
| DOM 18346 | 10.9 | H6 CHONDRITE | B | A | 20 | 17 | 4.950 | |
| DOM 18347 | 23.9 | H6 CHONDRITE | B/C | A | 20 | 17 | 5.000 | |
| DOM 18348 | 7.8 | CBb CHONDRITE | Be | A | 1-4 | 5.660 | ||
| DOM 18349 | 6.0 | L6 CHONDRITE | B/C | A | 25 | 20 | 5.070 | |
| DOM 18358 | 13.8 | L5 CHONDRITE | A/B | A | 24 | 21 | 4.530 | |
| DOM 18396 | 5.8 | CM2 CHONDRITE | A/B | A | 30 | 1 | 3.960 | |
| DOM 18430 | 2.3 | L6 CHONDRITE | B/Ce | B | 26 | 4.640 | ||
| DOM 18431 | 3.2 | L5 CHONDRITE | B/C | B | 24 | 21 | 4.420 | |
| DOM 18432 | 2.9 | H6 CHONDRITE | B/C | A/B | 19 | 17 | 4.960 | |
| DOM 18433 | 2.3 | L5 CHONDRITE | B/C | B | 25 | 21 | 4.490 | |
| DOM 18434 | 2.0 | L5 CHONDRITE | B/C | B | 25 | 21 | 4.530 | |
| DOM 18435 | 5.0 | L5 CHONDRITE | B/C | B | 25 | 21 | 4.620 | |
| DOM 18436 | 3.1 | L6 CHONDRITE | B/C | B | 25 | 21 | 4.520 | |
| DOM 18437 | 3.0 | H5 CHONDRITE | B/C | B/C | 20 | 18 | 5.150 | |
| DOM 18438 | 3.4 | H5 CHONDRITE | B/Ce | B | 19 | 17 | 5.020 | |
| DOM 18439 | 3.8 | L5 CHONDRITE | B/C | B/C | 25 | 21 | 4.650 | |
| DOM 18450 | 2.4 | L5 CHONDRITE | B/C | B | 25 | 21 | 4.500 | |
| DOM 18451 | 4.7 | H6 CHONDRITE | B/Ce | B | 19 | 17 | 5.210 | |
| DOM 18452 | 2.5 | L6 CHONDRITE | B/C | B | 25 | 21 | 4.560 | |
| DOM 18453 | 1.5 | L5 CHONDRITE | B/C | B | 25 | 21 | 4.590 | |
| DOM 18454 | 2.5 | H5 CHONDRITE | B/C | B | 19 | 17 | 5.150 | |
| DOM 18455 | 1.5 | L5 CHONDRITE | B/C | A/B | 24 | 21 | 4.340 | |
| DOM 18456 | 5.5 | H6 CHONDRITE | B/C | B/C | 20 | 17 | 4.900 | |
| DOM 18457 | 7.1 | H6 CHONDRITE | B/Ce | B | 20 | 17 | 4.910 | |
| DOM 18458 | 3.5 | L5 CHONDRITE | B/C | B | 25 | 21 | 4.560 | |
| DOM 18459 | 3.9 | H6 CHONDRITE | B/Ce | B | 20 | 17 | 4.950 | |
| DOM 18470 | 2.6 | H6 CHONDRITE | B/Ce | B | 20 | 17 | 4.950 | |
| DOM 18471 | 2.7 | L5 CHONDRITE | B/C | B | 25 | 21 | 4.540 | |
| DOM 18472 | 0.8 | L6 CHONDRITE | B/Ce | B/C | 25 | 22 | 4.580 | |
| DOM 18473 | 10.3 | L6 CHONDRITE | B/C | B/C | 24 | 21 | 4.520 | |
| DOM 18474 | 8.9 | L5 CHONDRITE | B/Ce | B/C | 25 | 21 | 4.560 | |
| DOM 18475 | 9.6 | L5 CHONDRITE | B/C | B/C | 25 | 4.600 | ||
| DOM 18476 | 6.6 | L5 CHONDRITE | B | B | 25 | 21 | 4.630 | |
| DOM 18477 | 10.5 | L5 CHONDRITE | B/C | B | 25 | 21 | 4.650 | |
| DOM 18478 | 24.3 | L5 CHONDRITE | B/C | B | 25 | 21 | 4.500 | |
| DOM 18479 | 24.5 | H6 CHONDRITE | B/C | B | 18 | 16 | 5.100 | |
| DOM 18658 | 18.6 | H6 CHONDRITE | B/Ce | B/C | 20 | 17 | 5.050 | |
| DOM 18677 | 8.7 | H6 CHONDRITE | B/C | A | 19 | 17 | 5.050 | |
| DOM 18720 | 21.3 | H6 CHONDRITE | B/Ce | A | 19 | 17 | 5.050 | |
| DOM 18863 | 2.0 | L6 CHONDRITE | B/C | A | 24 | 21 | 5.080 | |
| DOM 19210 | 12.3 | L5 CHONDRITE | B/C | A/B | 24 | 21 | 4.670 | |
| DOM 19211 | 7.2 | L5 CHONDRITE | B | B | 24 | 21 | 4.830 | |
| DOM 19212 | 2.8 | LL6 CHONDRITE | B/C | B | 30 | 25 | 4.970 | |
| DOM 19213 | 4.4 | H6 CHONDRITE | B/C | B | 17 | 16 | 4.170 | |
| DOM 19214 | 3.4 | H5 CHONDRITE | B/C | B | 20 | 17 | 4.970 | |
| DOM 19215 | 1.4 | H5 CHONDRITE | B/Ce | A/B | 19 | 17 | 4.790 | |
| DOM 19216 | 2.0 | L5 CHONDRITE | B/C | A/B | 25 | 21 | 4.540 | |
| DOM 19217 | 7.2 | L5 CHONDRITE | B/C | B | 25 | 21 | 4.680 | |
| DOM 19218 | 5.2 | L6 CHONDRITE | B/C | B | 25 | 21 | 4.450 | |
| DOM 19219 | 8.2 | L5 CHONDRITE | B/C | B | 25 | 21 | 4.630 | |
| DOM 19220 | 16.1 | H5 CHONDRITE | B/C | A | 19 | 17 | 5.040 | |
| DOM 19221 | 19.2 | H5 CHONDRITE | B/C | A/B | 19 | 16 | 3.890 | |
| DOM 19222 | 6.3 | H6 CHONDRITE | B/C | A | 20 | 17 | 5.020 | |
| DOM 19223 | 9.0 | H6 CHONDRITE | B/Ce | A | 19 | 17 | 5.090 | |
| DOM 19224 | 6.7 | H6 CHONDRITE | B/C | A | 19 | 17 | 4.930 | |
| DOM 19225 | 2.5 | L5 CHONDRITE | B/Ce | A/B | 25 | 21 | 4.500 | |
| DOM 19226 | 1.1 | L5 CHONDRITE | B/C | A | 25 | 21 | 4.490 | |
| DOM 19227 | 3.0 | L5 CHONDRITE | B/C | A/B | 25 | 21 | 4.600 | |
| DOM 19228 | 1.3 | L6 CHONDRITE | B/C | A/B | 25 | 22 | 4.620 | |
| DOM 19229 | 2.4 | L6 CHONDRITE | B/C | B | 25 | 21 | 4.990 | |
| DOM 19240 | 8.0 | H6 CHONDRITE | B/C | A/B | 19 | 17 | 4.890 | |
| DOM 19241 | 14.6 | H6 CHONDRITE | B/C | A/B | 20 | 16 | 5.000 | |
| DOM 19242 | 4.3 | H6 CHONDRITE | B/C | A/B | 19 | 17 | 4.910 | |
| DOM 19243 | 7.1 | H6 CHONDRITE | B/C | A | 19 | 16 | 5.010 | |
| DOM 19244 | 6.9 | L5 CHONDRITE | B/C | A | 24 | 21 | 4.590 | |
| DOM 19245 | 9.6 | L5 CHONDRITE | B | A | 25 | 21 | 4.560 | |
| DOM 19246 | 12.6 | H6 CHONDRITE | B/C | A | 19 | 16 | 4.900 | |
| DOM 19247 | 9.4 | H5 CHONDRITE | B/C | A/B | 19 | 17 | 4.990 | |
| DOM 19248 | 6.4 | H5 CHONDRITE | B/C | A/B | 19 | 17 | 4.970 | |
| DOM 19249 | 8.3 | H6 CHONDRITE | B/C | A | 18 | 16 | 4.500 | |
Classification of achondrites, carbonaceous chondrites and other unusual chondrites was done using electron microprobe analysis. Classification of the ordinary chondrites in Table 1 & 2 was done by Energy Dispersive Spectroscopic (EDS) methods using a Scanning Electron Microscope (SEM). This can include the analysis of several olivine and pyroxene grains to determine the approximate Fayalite and Ferrosilite values of the silicates, grouping them into H, L or LL chondrites. Petrologic types are determined by optical microscopy and are assigned based on the distinctiveness of chondrule boundaries on broken surfaces of a 1-3 g chip. While this technique is suitable for general characterization and delineation of equilibrated ordinary chondrites, those undertaking detailed study of any meteorite classified by optical methods alone should use caution. It is recommended that a polished thin section be requested to accompany any chip and appropriate steps for a more detailed characterization should be undertaken by the user. (Cari Corrigan, Smithsonian Institution) |
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