Volume 40 No. 2 – September 2017
Table 1. Newly Classified Antarctic Meteorites
| Sample Number | Weight (g) | Classification | Weathering |
Fracturing |
%Fa |
%Fs |
Magnetic Susceptibility | |
|---|---|---|---|---|---|---|---|---|
| DOM 14002 | 1403.0 | L4 CHONDRITE | A/B | B/C | 25 | 4.740 | ||
| DOM 14004 | 1340.8 | L5 CHONDRITE | A/B | A/B | 25 | 4.830 | ||
| DOM 14005 | 916.4 | L5 CHONDRITE | A/Be | A/B | 25 | 4.910 | ||
| DOM 14006 | 761.6 | H4 CHONDRITE | A/B | A/B | 19-20 | 5.280 | ||
| DOM 14007 | 296.8 | L6 CHONDRITE | Be | A/B | 25 | 4.800 | ||
| DOM 14008 | 304.3 | L5 CHONDRITE | A/B | A/B | 25 | 4.870 | ||
| DOM 14009 | 222.5 | LL5 CHONDRITE | B | B/C | 30 | 3.880 | ||
| DOM 14010 | 104.6 | L5 CHONDRITE | B | A | 25 | 4.610 | ||
| DOM 14011 | 221.6 | L5 CHONDRITE | B | A | 25.5 | 4.790 | ||
| DOM 14012 | 124.3 | L5 CHONDRITE | A/B | A/B | 25.5 | 4.580 | ||
| DOM 14013 | 74.3 | L5 CHONDRITE | B | A | 25 | 4.750 | ||
| DOM 14014 | 117.8 | L6 CHONDRITE | C | A | 25 | 4.700 | ||
| DOM 14015 | 111.6 | L5 CHONDRITE | Be | B | 26 | 4.670 | ||
| DOM 14016 | 61.7 | H6 CHONDRITE | Ce | A | 20 | 5.150 | ||
| DOM 14017 | 54.1 | L5 CHONDRITE | B | A/B | 24.5 | 4.550 | ||
| DOM 14018 | 130.1 | L5 CHONDRITE | Be | B | 25 | 4.610 | ||
| DOM 14020 | 132.9 | L6 CHONDRITE | B/Ce | A/B | 25 | 4.570 | ||
| DOM 14021 | 386.4 | EH3 CHONDRITE | A | A/B | 1 | 0-16 | 5.130 | |
| DOM 14022 | 423.2 | L6 CHONDRITE | Be | A/B | 26 | 4.790 | ||
| DOM 14023 | 145.8 | L6 CHONDRITE | B/C | A/B | 25 | 4.730 | ||
| DOM 14024 | 391.7 | L6 CHONDRITE | Be | C | 26 | 4.560 | ||
| DOM 14025 | 149.6 | H5 CHONDRITE | Ce | A/B | 19 | 5.290 | ||
| DOM 14026 | 99.4 | L6 CHONDRITE | B/Ce | A | 25 | 4.590 | ||
| DOM 14027 | 190.0 | L6 CHONDRITE | B | A/B | 25 | 4.750 | ||
| DOM 14028 | 110.2 | L5 CHONDRITE | B | A/B | 25 | 4.800 | ||
| DOM 14029 | 118.8 | H5 CHONDRITE | Be | A | 19 | 4.990 | ||
| DOM 14040 | 8.4 | L5 CHONDRITE | B/C | A | 26 | 4.660 | ||
| DOM 14041 | 9.3 | L5 CHONDRITE | B/C | A | 25 | 4.630 | ||
| DOM 14042 | 10.0 | H6 CHONDRITE | B/C | A | 20 | 5.180 | ||
| DOM 14043 | 12.9 | L6 CHONDRITE | B/C | A | 26 | 4.420 | ||
| DOM 14044 | 16.5 | L6 CHONDRITE | B/C | A | 26 | 4.590 | ||
| DOM 14045 | 15.4 | L5 CHONDRITE | B/C | A | 25 | 4.590 | ||
| DOM 14046 | 6.7 | L5 CHONDRITE | B/C | A | 26 | 4.580 | ||
| DOM 14047 | 9.4 | H6 CHONDRITE | B/C | A | 20 | 4.940 | ||
| DOM 14048 | 10.4 | L6 CHONDRITE | B/C | A | 26 | 4.570 | ||
| DOM 14049 | 27.4 | L6 CHONDRITE | B/C | A | 26 | 4.650 | ||
| DOM 14050 | 8.0 | H6 CHONDRITE | B/C | A | 20 | 4.900 | ||
| DOM 14051 | 19.0 | L6 CHONDRITE | A/B | A | 26 | 4.690 | ||
| DOM 14052 | 19.0 | L6 CHONDRITE | B | A | 25 | 4.480 | ||
| DOM 14053 | 22.6 | H6 CHONDRITE | B/C | A | 20 | 4.930 | ||
| DOM 14054 | 23.4 | L6 CHONDRITE | B | A/B | 25 | 4.580 | ||
| DOM 14055 | 16.9 | H6 CHONDRITE | C | A/B | 20 | 4.930 | ||
| DOM 14056 | 13.7 | L4 CHONDRITE | B/C | A/B | 26 | 4.620 | ||
| DOM 14057 | 11.4 | L6 CHONDRITE | B/C | A | 25 | 4.620 | ||
| DOM 14058 | 10.7 | H6 CHONDRITE | B/C | A/B | 21 | 5.100 | ||
| DOM 14059 | 6.8 | L6 CHONDRITE | B | A | 25 | 4.560 | ||
| DOM 14060 | 34.1 | L5 CHONDRITE | A/B | A | 25 | 4.570 | ||
| DOM 14061 | 59.9 | L5 CHONDRITE | A/B | A/B | 25 | 4.690 | ||
| DOM 14062 | 32.8 | L5 CHONDRITE | B/C | A/B | 25 | 4.570 | ||
| DOM 14063 | 27.3 | L5 CHONDRITE | A/B | A | 25 | 4.620 | ||
| DOM 14064 | 23.2 | L6 CHONDRITE | B/C | A | 25 | 4.730 | ||
| DOM 14065 | 41.2 | L5 CHONDRITE | A/B | A/B | 25 | 4.650 | ||
| DOM 14066 | 24.3 | L6 CHONDRITE | B/C | A/B | 25 | 4.590 | ||
| DOM 14067 | 24.7 | L6 CHONDRITE | B/C | A | 25 | 4.740 | ||
| DOM 14068 | 19.0 | H5 CHONDRITE | B/C | A | 20 | 4.870 | ||
| DOM 14069 | 36.3 | L5 CHONDRITE | A/B | A | 24 | 4.760 | ||
| DOM 14070 | 23.6 | L5 CHONDRITE | B | A | 25 | 4.650 | ||
| DOM 14071 | 15.6 | L5 CHONDRITE | B/C | A/B | 26 | 4.550 | ||
| DOM 14072 | 26.2 | L6 CHONDRITE | B | A | 26 | 4.600 | ||
| DOM 14073 | 16.8 | H6 CHONDRITE | Ce | A | 20 | 4.990 | ||
| DOM 14074 | 23.7 | H6 CHONDRITE | C | A/B | 20 | 4.820 | ||
| DOM 14075 | 18.9 | L5 CHONDRITE | B | A | 26 | 4.590 | ||
| DOM 14076 | 12.5 | L5 CHONDRITE | C | A | 25 | 4.680 | ||
| DOM 14077 | 12.0 | L5 CHONDRITE | B/C | A/B | 25 | 4.520 | ||
| DOM 14078 | 15.3 | L5 CHONDRITE | B/C | A | 25 | 4.560 | ||
| DOM 14079 | 4.9 | L6 CHONDRITE | Ce | A | 25 | 4.550 | ||
| DOM 14090 | 17.2 | H5 CHONDRITE | C | A | 19 | 5.150 | ||
| DOM 14091 | 12.4 | L5 CHONDRITE | C | A | 25 | 4.520 | ||
| DOM 14092 | 13.2 | L5 CHONDRITE | C | A | 25-27 | 21 | 4.620 | |
| DOM 14093 | 11.8 | L5 CHONDRITE | Be | A | 25.5 | 4.490 | ||
| DOM 14094 | 13.8 | L6 CHONDRITE | Be | A | 25.5 | 4.560 | ||
| DOM 14095 | 13.7 | L6 CHONDRITE | B/C | A/B | 26 | 4.530 | ||
| DOM 14096 | 11.3 | L5 CHONDRITE | B | A | 25 | 4.650 | ||
| DOM 14097 | 13.8 | L5 CHONDRITE | B | A | 26 | 4.630 | ||
| DOM 14098 | 17.1 | L6 CHONDRITE | B | A | 25 | 4.590 | ||
| DOM 14099 | 26.2 | L5 CHONDRITE | B | B | 26 | 4.480 | ||
| DOM 14110 | 26.8 | L6 CHONDRITE | B | A | 25 | 4.490 | ||
| DOM 14111 | 38.8 | L5 CHONDRITE | B | A | 26 | 4.540 | ||
| DOM 14112 | 18.8 | H6 CHONDRITE | B/Ce | A | 20 | 4.920 | ||
| DOM 14113 | 25.4 | L6 CHONDRITE | B | A/B | 24 | 4.500 | ||
| DOM 14114 | 25.6 | L5 CHONDRITE | A/B | A | 25 | 4.520 | ||
| DOM 14115 | 17.3 | L4 CHONDRITE | A/Be | A | 25 | 4.500 | ||
| DOM 14116 | 28.5 | L4 CHONDRITE | B/c | A | 26 | 4.500 | ||
| DOM 14117 | 22.2 | L6 CHONDRITE | A/B | A | 26 | 4.540 | ||
| DOM 14118 | 21.8 | IRON-IAB | A/B | A | 5.490 | |||
| DOM 14119 | 23.8 | L6 CHONDRITE | B/C | A | 26 | 4.440 | ||
| DOM 14140 | 13.6 | H6 CHONDRITE | Ce | A/B | 20 | 4.920 | ||
| DOM 14141 | 13.2 | L6 CHONDRITE | B | A | 26 | 4.640 | ||
| DOM 14142 | 17.3 | H6 CHONDRITE | B/Ce | A/B | 20 | 5.300 | ||
| DOM 14143 | 3.6 | L5 CHONDRITE | Ce | A | 26 | 4.700 | ||
| DOM 14144 | 8.7 | L6 CHONDRITE | Ce | A | 26 | 4.630 | ||
| DOM 14145 | 22.3 | L6 CHONDRITE | Be | A/B | 26 | 4.490 | ||
| DOM 14146 | 15.8 | H6 CHONDRITE | Ce | A | 21 | 4.930 | ||
| DOM 14147 | 10.3 | H5 CHONDRITE | Ce | B | 17 | 16 | 5.180 | |
| DOM 14148 | 7.8 | H5 CHONDRITE | Ce | B | 20 | 5.310 | ||
| DOM 14149 | 17.0 | L5 CHONDRITE | B | A | 26 | 4.510 | ||
| DOM 14150 | 13.6 | H6 CHONDRITE | Ce | A/B | 19 | 5.240 | ||
| DOM 14151 | 13.2 | L5 CHONDRITE | B/C | A | 24 | 4.610 | ||
| DOM 14152 | 17.6 | L5 CHONDRITE | B/C | A | 25 | 4.620 | ||
| DOM 14153 | 6.2 | H6 CHONDRITE | Ce | A/B | 19 | 5.160 | ||
| DOM 14154 | 13.1 | L6 CHONDRITE | B/C | A | 25 | 4.550 | ||
| DOM 14155 | 20.1 | H6 CHONDRITE | Ce | A | 19 | 4.980 | ||
| DOM 14156 | 29.8 | H5 CHONDRITE | C | A/B | 19 | 4.880 | ||
| DOM 14157 | 5.7 | L5 CHONDRITE | Ce | A/B | 25 | 21 | 4.590 | |
| DOM 14158 | 4.4 | H6 CHONDRITE | Ce | A/B | 20 | 5.110 | ||
| DOM 14159 | 16.3 | H6 CHONDRITE | Ce | A/B | 20 | 5.060 | ||
| DOM 14160 | 12.0 | L5 CHONDRITE | B/C | A | 25 | 5.520 | ||
| DOM 14161 | 25.8 | L4 CHONDRITE | B/C | A | 25 | 4.570 | ||
| DOM 14162 | 20.4 | L6 CHONDRITE | B/C | A/B | 25 | 4.450 | ||
| DOM 14163 | 9.4 | L6 CHONDRITE | B/C | A | 25 | 4.630 | ||
| DOM 14164 | 17.2 | L5 CHONDRITE | A/B | A | 25 | 4.600 | ||
| DOM 14165 | 9.7 | L5 CHONDRITE | B/C | A | 26 | 4.550 | ||
| DOM 14166 | 9.6 | L5 CHONDRITE | A/B | A | 25 | 4.550 | ||
| DOM 14167 | 14.9 | L5 CHONDRITE | B/C | A | 26 | 4.530 | ||
| DOM 14168 | 11.8 | L5 CHONDRITE | B/C | A | 26 | 4.650 | ||
| DOM 14280 | 16.8 | L4 CHONDRITE | B | A | 25 | 4.780 | ||
| DOM 14281 | 16.7 | H5 CHONDRITE | B/Ce | A | 19 | 17 | 5.130 | |
| DOM 14282 | 15.5 | L5 CHONDRITE | C | A/B | 25 | 4.930 | ||
| DOM 14283 | 15.7 | H6 CHONDRITE | C | A | 19 | 4.930 | ||
| DOM 14284 | 20.4 | L6 CHONDRITE | C | B | 25 | 4.540 | ||
| DOM 14285 | 15.6 | H6 CHONDRITE | Ce | A/B | 20 | 5.180 | ||
| DOM 14286 | 15.3 | L6 CHONDRITE | B/C | A | 26 | 4.780 | ||
| DOM 14287 | 8.9 | L6 CHONDRITE | B | A | 25 | 4.760 | ||
| DOM 14288 | 6.5 | L5 CHONDRITE | B/C | A | 25 | 4.740 | ||
| DOM 14320 | 16.1 | L5 CHONDRITE | C | A | 26 | 4.620 | ||
| DOM 14321 | 15.0 | L5 CHONDRITE | B/C | A | 25 | 4.530 | ||
| DOM 14322 | 19.2 | L6 CHONDRITE | B | A/B | 24 | 4.490 | ||
| DOM 14323 | 14.1 | L6 CHONDRITE | C | B | 25 | 4.530 | ||
| DOM 14324 | 15.4 | L5 CHONDRITE | B/C | B | 26 | 4.520 | ||
| DOM 14325 | 15.2 | L4 CHONDRITE | B | A/B | 25 | 4.520 | ||
| DOM 14326 | 8.9 | L4 CHONDRITE | B | A | 24 | 4.540 | ||
| DOM 14327 | 11.6 | L4 CHONDRITE | B/C | A/B | 26 | 4.600 | ||
| DOM 14328 | 10.9 | L5 CHONDRITE | C | A/B | 25 | 4.630 | ||
| DOM 14329 | 19.0 | H6 CHONDRITE | Ce | B | 20 | 4.920 | ||
| DOM 14330 | 13.1 | LL5 CHONDRITE | C | A | 29 | 4.750 | ||
| DOM 14331 | 18.5 | L6 CHONDRITE | C | B | 25 | 21 | 4.470 | |
| DOM 14332 | 17.4 | L6 CHONDRITE | B/Ce | B | 25 | 4.560 | ||
| DOM 14333 | 10.8 | L5 CHONDRITE | B | B | 26 | 4.600 | ||
| DOM 14334 | 13.7 | L5 CHONDRITE | B/C | A | 25 | 4.630 | ||
| DOM 14335 | 11.3 | L5 CHONDRITE | B/C | B | 26 | 4.620 | ||
| DOM 14336 | 8.7 | L6 CHONDRITE | B/C | A | 25 | 4.590 | ||
| DOM 14337 | 8.2 | L5 CHONDRITE | B/C | A | 25 | 4.680 | ||
| DOM 14338 | 10.4 | L4 CHONDRITE | B/C | B | 26 | 4.650 | ||
| DOM 14339 | 6.2 | H6 CHONDRITE | C | A | 19 | 17 | 5.080 | |
| DOM 14370 | 4.6 | H5 CHONDRITE | A/B | A/B | 17 | 5.190 | ||
| DOM 14371 | 15.4 | L6 CHONDRITE | Be | A | 26 | 4.550 | ||
| DOM 14372 | 19.6 | L6 CHONDRITE | A/B | A | 24 | 4.550 | ||
| DOM 14373 | 13.5 | L6 CHONDRITE | B/C | A | 25 | 4.520 | ||
| DOM 14374 | 17.0 | L6 CHONDRITE | B/C | A | 25 | 4.350 | ||
| DOM 14380 | 2.6 | L4 CHONDRITE | C | A/B | 24.5 | 4.690 | ||
| DOM 14381 | 2.9 | H6 CHONDRITE | Ce | A/B | 20 | 5.190 | ||
| DOM 14382 | 11.3 | L5 CHONDRITE | C | A/B | 25 | 4.630 | ||
| DOM 14383 | 8.2 | L6 CHONDRITE | C | A | 26 | 4.200 | ||
| DOM 14384 | 5.8 | H6 CHONDRITE | Ce | A/B | 20 | 5.210 | ||
| DOM 14385 | 11.6 | H6 CHONDRITE | C | A/B | 19 | 4.880 | ||
| DOM 14386 | 11.9 | H5 CHONDRITE | C | A/B | 19 | 4.760 | ||
| DOM 14387 | 11.2 | L6 CHONDRITE | Ce | B | 25 | 4.650 | ||
| DOM 14388 | 15.0 | H6 CHONDRITE | C | A | 19 | 4.880 | ||
| DOM 14389 | 19.3 | L5 CHONDRITE | B/C | A | 25 | 4.660 | ||
| DOM 14440 | 15.9 | H4 CHONDRITE | B/Ce | A/B | 20 | 4.960 | ||
| DOM 14441 | 11.2 | H6 CHONDRITE | B/C | A | 19 | 4.970 | ||
| DOM 14442 | 14.3 | L5 CHONDRITE | A/B | A | 26 | 4.620 | ||
| DOM 14443 | 6.2 | H6 CHONDRITE | B/Ce | A | 19 | 5.060 | ||
| DOM 14444 | 5.2 | H6 CHONDRITE | B/C | A/B | 20 | 5.020 | ||
| DOM 14446 | 5.7 | H5 CHONDRITE | B/C | A | 20 | 5.090 | ||
| DOM 14447 | 10.1 | H6 CHONDRITE | B/C | A | 20 | 5.210 | ||
| DOM 14448 | 12.1 | L6 CHONDRITE | B/C | A | 25 | 4.330 | ||
| DOM 14449 | 7.1 | H5 CHONDRITE | B/C | A/B | 19 | 5.370 | ||
| DOM 14480 | 10.4 | L5 CHONDRITE | A/B | A | 25 | 4.610 | ||
| DOM 14481 | 20.1 | L6 CHONDRITE | A/B | A | 25 | 4.550 | ||
| DOM 14482 | 13.1 | L5 CHONDRITE | A/B | A | 25 | 4.450 | ||
| DOM 14483 | 11.6 | L5 CHONDRITE | B/C | A | 26 | 4.620 | ||
| DOM 14484 | 5.4 | L4 CHONDRITE | B/C | A | 25 | 4.360 | ||
| DOM 14485 | 9.1 | L5 CHONDRITE | A/B | A/B | 25 | 4.600 | ||
| DOM 14486 | 16.9 | H6 CHONDRITE | B/C | A | 17 | 5.090 | ||
| DOM 14487 | 12.2 | L5 CHONDRITE | B | A | 26 | 4.570 | ||
| DOM 14488 | 17.9 | L5 CHONDRITE | A/B | A/B | 25 | 4.490 | ||
| DOM 14489 | 20.0 | H5 CHONDRITE | B | A | 20 | 4.480 | ||
| DOM 14540 | 15.5 | LL4 CHONDRITE | Be | B | 28 | 4.990 | ||
| DOM 14541 | 18.8 | L5 CHONDRITE | B/C | A/B | 25 | 4.560 | ||
| DOM 14542 | 9.9 | L5 CHONDRITE | Ce | A | 25 | 4.640 | ||
| DOM 14543 | 12.7 | LL5 CHONDRITE | B | A/B | 28 | 4.560 | ||
| DOM 14544 | 17.9 | L6 CHONDRITE | Ce | A | 25 | 4.510 | ||
| DOM 14545 | 7.2 | H6 CHONDRITE | Ce | A | 20 | 4.810 | ||
| DOM 14546 | 16.7 | L5 CHONDRITE | Be | B | 25 | 4.460 | ||
| DOM 14547 | 10.9 | L5 CHONDRITE | B | A | 26 | 4.600 | ||
| DOM 14548 | 11.9 | L5 CHONDRITE | B | A | 26 | 4.530 | ||
| DOM 14549 | 16.4 | L5 CHONDRITE | B/Ce | A | 26 | 4.580 | ||
| EET 16006 | 50.2 | CK5 CHONDRITE | Ae | B | 31 | 4.530 | ||
| EET 16029 | 3.2 | CK5 CHONDRITE | A | A/B | 30 | 4.720 | ||
| EET 16039 | 8.4 | HOWARDITE | A | B | 32-53 | 91-93 | 2.930 | |
| EET 16044 | 61.7 | DIOGENITE | A | B | 25-29 | 2.620 | ||
| EET 16046 | 69.5 | IRON-IAB | A/B | B | 3-4 | 5-7 | ||
| EET 16047 | 46.3 | IRON-IAB | A/B | A | 3-4 | 5-7 | ||
| EET 16048 | 0.9 | CK5 CHONDRITE | A/B | A | 30 | 4.750 | ||
| EET 16049 | 39.6 | CK5 CHONDRITE | A/B | A | 30 | 4.590 | ||
| EET 16050 | 0.5 | CM2 CHONDRITE | B | A | 0-48 | 1 | 4.240 | |
| EET 16079 | 3.5 | CM2 CHONDRITE | A/Be | A/B | 0-28 | 1 | 4.030 | |
| EET 16097 | 4.1 | CM2 CHONDRITE | Ae | A/B | 1-3 | 4.830 | ||
| EET 16100 | 3.6 | CM1 CHONDRITE | Ae | B/C | 3.800 | |||
| EET 16119 | 4.1 | HOWARDITE | A | A/B | 25-52 | 3.770 | ||
| EET 16127 | 1.7 | CM2 CHONDRITE | Be | A/B | 1-32 | 4.480 | ||
| EET 16128 | 1.2 | CM2 CHONDRITE | B | B | 0-24 | 1-38 | 4.880 | |
| EET 16129 | 0.7 | CM1/2 CHONDRITE | Be | B | 1-38 | 3.810 | ||
| EET 16170 | 10.7 | CK5 CHONDRITE | A/Be | A/B | 30 | 4.670 | ||
| EET 16171 | 0.7 | CM2 CHONDRITE | Be | A/B | 1-36 | 3.940 | ||
| EET 16172 | 1.2 | CK5 CHONDRITE | A/B | A | 30 | 8 | 4.720 | |
| EET 16174 | 1.1 | LL4 CHONDRITE | A/B | B | 28 | 23 | 4.100 | |
| EET 16199 | 0.7 | WINONAITE | Ce | B | 6-9 | 1-7 | ||
| EET 16201 | 1.0 | CK5 CHONDRITE | A | A | 30 | 11-25 | ||
| EET 16203 | 1.1 | CK5 CHONDRITE | A | B | 30 | |||
| EET 16212 | 1.0 | ACAPULCOITE | B | A | 10 | 11 | ||
| MIL 15188 | 1.1 | CM2 CHONDRITE | A | A | 0-43 | |||
| MIL 15228 | 0.4 | L5 CHONDRITE | A/B | A | 25 | |||
| MIL 15438 | 1.2 | LL5 CHONDRITE | B | A | 29 | 24 | ||
| MIL 15470 | 0.6 | H CHONDRITE (IMPACT MELT) | Ce | B/C | 19 | 17 | ||
| MIL 15524 | 1.4 | CV3 CHONDRITE | C | C | 1-12 | 1 | ||
| MIL 15530 | 0.7 | UREILITE | A | B | 10-18 | 15 | ||
| MIL 15553 | 1.1 | H5 CHONDRITE | C | A/B | 19 | 17 | ||
| MIL 15565 | 0.9 | CV3 CHONDRITE | B | C | 1-28 | 1 | ||
| MIL 15568 | 1.2 | H5 CHONDRITE | A/Be | B | 19 | 16 | ||
| MIL 15569 | 0.7 | H5 CHONDRITE | A/Be | B | 18 | 16 | ||
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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