1411:
603:
Shiraishi, R., Ohtani, E., Kanagawa, K., Shimojuku, A., and Zhao, D. (2008) Crystallographic preferred orientation of akimotoite and seismic anisotropy of Tonga slab. Nature, 455, 657-660
377:
enters into the lower mantle. Akimotoite is elastically anisotropic and has been suggested as a cause of seismic anisotropy in the lower transition zone and uppermost lower mantle.
407:
249:
that is the most abundant mineral in Earth's silicate mantle. Akimotoite has a vitreous luster, is colorless, and has a white or colorless streak. It crystallizes in the
1452:
277:) with Si and Mg in regular octahedral coordination with oxygen. The Si and Mg octahedra align in discrete layers alternating up the c-axis. The space group is R
503:
594:
Horiuchi, H., Hirano, M., Ito, E., and Matsui, Y. (1982) MgSiO3 (ilmenite-type): single crystal X-ray diffraction study. American
Mineralogist, 67, 788-793
1264:
1486:
1315:
631:
1445:
705:
1332:
76:
1337:
1491:
1438:
191:
758:
1476:
1320:
1144:
1481:
1269:
1259:
1048:
1043:
744:
1327:
753:
681:
981:
749:
740:
730:
624:
1289:
347:
1471:
661:
386:
66:
775:
327:
297:, Australia. It is believed to have formed as the result of an extraterrestrial shock event. It is the
1227:
1197:
1004:
999:
918:
363:
359:
1237:
1134:
1116:
870:
419:
1139:
811:
617:
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181:
169:
373:
at depths of 600–800 kilometres (370–500 mi) in cooler regions of the mantle such as where a
1232:
1084:
829:
577:
437:
310:
159:
504:"Akimotoite, (Mg,Fe)SiO 3, a new silicate mineral of the ilmenite group in the Tenham chondrite"
1390:
1358:
1038:
1031:
991:
698:
569:
370:
290:
136:
1422:
1418:
1016:
561:
530:
518:
427:
339:
335:
331:
223:
201:
47:
1410:
1252:
1073:
1026:
963:
893:
174:
423:
1062:
971:
888:
710:
693:
666:
86:
35:
550:"Discovery of bridgmanite, the most abundant mineral in Earth, in a shocked meteorite"
549:
1465:
1378:
1284:
1274:
1106:
1089:
936:
441:
351:
98:
581:
1368:
1124:
1011:
976:
844:
786:
686:
534:
281:(trigonal) with a = 4.7284 Å; c = 13.5591 Å; V = 262.94 Å; Z = 6.
1296:
1192:
1176:
1171:
878:
839:
834:
720:
644:
242:
121:
1211:
883:
861:
484:
374:
302:
294:
258:
109:
609:
1385:
1247:
1216:
1129:
951:
941:
908:
898:
851:
824:
767:
715:
676:
652:
640:
565:
573:
1353:
1021:
903:
250:
238:
227:
91:
39:
432:
1166:
946:
931:
926:
355:
298:
519:"Natural (Mg,Fe)SiO3-Ilmenite and -Perovskite in the Tenham Meteorite"
466:
1373:
671:
1363:
343:
613:
273:
The crystal structure is similar to that of ilmenite (FeTiO
369:
Akimotoite is believed to be a significant mineral in the
1426:
16:
Rare silicate mineral in the ilmenite group of minerals
1305:
1210:
1185:
1159:
1115:
1061:
990:
962:
917:
869:
860:
766:
738:
729:
651:
210:
200:
190:
180:
168:
158:
150:
145:
135:
120:
97:
85:
75:
65:
46:
31:
26:
21:
316:
141:a = 4.7284, c = 13.5591 ; Z = 6
1446:
625:
230:group of minerals, with the chemical formula
8:
1453:
1439:
866:
763:
735:
632:
618:
610:
431:
461:
459:
457:
455:
453:
451:
233:
58:
548:Tschauner, Oliver; et al. (2014).
398:
18:
7:
1407:
1405:
408:"IMA–CNMNC approved mineral symbols"
323:) (1925–2004), University of Tokyo.
326:It has also been reported from the
1425:. You can help Knowledge (XXG) by
14:
1409:
313:(also known as Shun'ichi Akimoto
309:). It was named after physicist
257:. It is the silicon analogue of
253:crystal system in space group R
1417:This article about a specific
1:
535:10.1126/science.277.5329.1084
289:Akimotoite was found in the
1487:Minerals in space group 148
1508:
1404:
1270:extraterrestrial materials
237:. It is polymorphous with
1346:
317:
517:Tomioka; Fujino (1997).
502:Tomioka; Fujino (1999).
348:Zagami Martian meteorite
1049:Meteorites on Mars list
1044:Martian meteorites list
566:10.1126/science.1259369
387:Glossary of meteoritics
1492:Silicate mineral stubs
412:Mineralogical Magazine
1198:Nonmagmatic meteorite
364:Randall County, Texas
77:Strunz classification
1265:Ca–Al-rich inclusion
328:Sixiangkou meteorite
560:(6213): 1100–1102.
529:(5329): 1084–1086.
433:10.1180/mgm.2021.43
424:2021MinM...85..291W
406:Warr, L.N. (2021).
247:silicate perovskite
1477:Meteorite minerals
360:Umbarger meteorite
340:Taizhou Prefecture
186:white or colorless
1482:Trigonal minerals
1434:
1433:
1399:
1398:
1391:Near-Earth object
1359:Atmospheric entry
1206:
1205:
1155:
1154:
1057:
1056:
291:Tenham meteorites
269:Crystal structure
217:
216:
1499:
1455:
1448:
1441:
1419:silicate mineral
1413:
1406:
1224:Characteristics
1000:Basaltic Breccia
867:
764:
736:
634:
627:
620:
611:
604:
601:
595:
592:
586:
585:
545:
539:
538:
514:
508:
507:
499:
493:
492:
481:
475:
474:
463:
446:
445:
435:
403:
336:Jiangsu Province
332:Gaogang District
322:
320:
319:
311:Syun-iti Akimoto
280:
256:
236:
224:silicate mineral
206:3.81(calculated)
202:Specific gravity
131:
115:
106:
61:
53:
52:(repeating unit)
19:
1507:
1506:
1502:
1501:
1500:
1498:
1497:
1496:
1462:
1461:
1460:
1459:
1402:
1400:
1395:
1342:
1301:
1214:
1202:
1181:
1151:
1111:
1053:
1027:Orthopyroxenite
986:
958:
913:
856:
756:
748:
725:
647:
638:
608:
607:
602:
598:
593:
589:
547:
546:
542:
516:
515:
511:
501:
500:
496:
483:
482:
478:
465:
464:
449:
405:
404:
400:
395:
383:
314:
308:
287:
278:
276:
271:
264:
254:
235:
231:
129:
113:
108:
104:
60:
56:
51:
50:
38:
17:
12:
11:
5:
1505:
1503:
1495:
1494:
1489:
1484:
1479:
1474:
1472:Oxide minerals
1464:
1463:
1458:
1457:
1450:
1443:
1435:
1432:
1431:
1414:
1397:
1396:
1394:
1393:
1388:
1383:
1382:
1381:
1371:
1366:
1361:
1356:
1347:
1344:
1343:
1341:
1340:
1335:
1330:
1325:
1324:
1323:
1318:
1312:Meteorites by
1309:
1307:
1303:
1302:
1300:
1299:
1294:
1293:
1292:
1287:
1279:
1278:
1277:
1272:
1267:
1257:
1256:
1255:
1250:
1242:
1241:
1240:
1235:
1230:
1221:
1219:
1208:
1207:
1204:
1203:
1201:
1200:
1195:
1189:
1187:
1186:Obsolete terms
1183:
1182:
1180:
1179:
1174:
1169:
1163:
1161:
1157:
1156:
1153:
1152:
1150:
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1137:
1127:
1121:
1119:
1113:
1112:
1110:
1109:
1104:
1101:
1098:
1095:
1092:
1087:
1082:
1079:
1076:
1071:
1067:
1065:
1059:
1058:
1055:
1054:
1052:
1051:
1046:
1041:
1036:
1035:
1034:
1024:
1019:
1014:
1009:
1008:
1007:
996:
994:
988:
987:
985:
984:
979:
974:
972:Impact breccia
968:
966:
960:
959:
957:
956:
955:
954:
949:
944:
934:
929:
923:
921:
915:
914:
912:
911:
906:
901:
896:
891:
886:
881:
875:
873:
864:
858:
857:
855:
854:
849:
848:
847:
842:
837:
827:
822:
821:
820:
817:
809:
808:
807:
804:
801:
798:
795:
792:
789:
784:
781:
772:
770:
761:
733:
731:Classification
727:
726:
724:
723:
718:
713:
711:Micrometeorite
708:
703:
702:
701:
691:
690:
689:
684:
679:
674:
664:
658:
656:
649:
648:
639:
637:
636:
629:
622:
614:
606:
605:
596:
587:
540:
509:
494:
476:
447:
418:(3): 291–320.
397:
396:
394:
391:
390:
389:
382:
379:
375:subducted slab
371:Earth's mantle
306:
286:
283:
274:
270:
267:
262:
215:
214:
212:
208:
207:
204:
198:
197:
194:
188:
187:
184:
178:
177:
172:
166:
165:
164:perfect (0001)
162:
156:
155:
152:
148:
147:
146:Identification
143:
142:
139:
133:
132:
124:
118:
117:
103:Rhombohedral (
101:
95:
94:
89:
87:Crystal system
83:
82:
79:
73:
72:
69:
63:
62:
54:
44:
43:
36:Oxide minerals
33:
29:
28:
24:
23:
15:
13:
10:
9:
6:
4:
3:
2:
1504:
1493:
1490:
1488:
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1483:
1480:
1478:
1475:
1473:
1470:
1469:
1467:
1456:
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1392:
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1380:
1377:
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1370:
1367:
1365:
1362:
1360:
1357:
1355:
1352:
1349:
1348:
1345:
1339:
1338:Organizations
1336:
1334:
1331:
1329:
1326:
1322:
1319:
1317:
1316:find location
1314:
1313:
1311:
1310:
1308:
1304:
1298:
1295:
1291:
1290:Widmanstätten
1288:
1286:
1285:Neumann lines
1283:
1282:
1280:
1276:
1275:meteoric iron
1273:
1271:
1268:
1266:
1263:
1262:
1261:
1258:
1254:
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1249:
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1234:
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1199:
1196:
1194:
1191:
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1188:
1184:
1178:
1175:
1173:
1170:
1168:
1165:
1164:
1162:
1158:
1146:
1143:
1141:
1140:Eagle Station
1138:
1136:
1133:
1132:
1131:
1128:
1126:
1123:
1122:
1120:
1118:
1114:
1108:
1105:
1102:
1099:
1096:
1093:
1091:
1088:
1086:
1083:
1080:
1077:
1075:
1072:
1069:
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1066:
1064:
1060:
1050:
1047:
1045:
1042:
1040:
1037:
1033:
1030:
1029:
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1001:
998:
997:
995:
993:
989:
983:
980:
978:
975:
973:
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969:
967:
965:
961:
953:
950:
948:
945:
943:
940:
939:
938:
935:
933:
930:
928:
925:
924:
922:
920:
916:
910:
907:
905:
902:
900:
897:
895:
892:
890:
887:
885:
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880:
877:
876:
874:
872:
868:
865:
863:
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850:
846:
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838:
836:
833:
832:
831:
828:
826:
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815:
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802:
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790:
788:
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771:
769:
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755:
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734:
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669:
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650:
646:
642:
635:
630:
628:
623:
621:
616:
615:
612:
600:
597:
591:
588:
583:
579:
575:
571:
567:
563:
559:
555:
551:
544:
541:
536:
532:
528:
524:
520:
513:
510:
505:
498:
495:
490:
486:
480:
477:
472:
468:
462:
460:
458:
456:
454:
452:
448:
443:
439:
434:
429:
425:
421:
417:
413:
409:
402:
399:
392:
388:
385:
384:
380:
378:
376:
372:
367:
365:
361:
358:and from the
357:
353:
352:Katsina State
349:
345:
341:
337:
333:
329:
324:
312:
304:
300:
296:
292:
284:
282:
268:
266:
260:
252:
248:
244:
240:
229:
225:
221:
213:
209:
205:
203:
199:
195:
193:
189:
185:
183:
179:
176:
173:
171:
167:
163:
161:
157:
153:
149:
144:
140:
138:
134:
128:
125:
123:
119:
111:
102:
100:
99:Crystal class
96:
93:
90:
88:
84:
80:
78:
74:
70:
68:
64:
55:
49:
45:
41:
37:
34:
30:
25:
20:
1427:expanding it
1416:
1401:
1369:Impact event
1350:
1125:Mesosiderite
1039:Shergottites
1012:Chassignites
977:Mare basalts
776:Carbonaceous
687:strewn field
599:
590:
557:
553:
543:
526:
522:
512:
497:
488:
485:"Akimotoite"
479:
470:
467:"Akimotoite"
415:
411:
401:
368:
325:
301:analogue of
288:
272:
245:, a natural
219:
218:
126:
1297:CI1 fossils
1193:Amphoterite
1177:Octahedrite
1172:Hexahedrite
879:Acapulcoite
806:C ungrouped
721:Parent body
645:meteoritics
243:bridgmanite
196:Transparent
192:Diaphaneity
122:Space group
1466:Categories
1238:weathering
1212:Mineralogy
1160:Structural
1135:Main group
1117:Stony-iron
919:Asteroidal
884:Brachinite
862:Achondrite
682:statistics
641:Meteorites
489:Webmineral
471:Mindat.org
393:References
303:geikielite
295:Queensland
285:Occurrence
259:geikielite
232:(Mg,Fe)SiO
222:is a rare
220:Akimotoite
211:References
110:H-M symbol
67:IMA symbol
57:(Mg,Fe)SiO
22:Akimotoite
1386:Meteoroid
1351:See also:
1281:Patterns
1248:chondrule
1217:petrology
1130:Pallasite
1022:Nakhlites
952:Howardite
942:Diogenite
909:Winonaite
899:Lodranite
871:Primitive
825:Kakangari
812:Enstatite
768:Chondrite
677:impactite
653:Meteorite
442:235729616
241:and with
154:Colorless
137:Unit cell
1354:Asteroid
1333:Journals
1260:Minerals
1253:presolar
1145:Pyroxene
1032:ALH84001
1005:NWA 7034
904:Ureilite
852:Rumuruti
830:Ordinary
759:grouplet
662:Glossary
582:20999417
574:25430766
381:See also
251:trigonal
239:pyroxene
228:ilmenite
175:vitreous
160:Cleavage
92:Trigonal
40:Ilmenite
32:Category
1244:Grains
1167:Ataxite
992:Martian
947:Eucrite
932:Aubrite
927:Angrite
716:Notable
706:Largest
699:hunting
554:Science
523:Science
420:Bibcode
356:Nigeria
330:in the
299:silicon
226:in the
81:4.CB.05
48:Formula
27:General
1379:shower
1374:Meteor
1328:Awards
1017:Kaidun
672:bolide
580:
572:
440:
346:; the
305:(MgTiO
261:(MgTiO
182:Streak
170:Luster
1421:is a
1364:Comet
1306:Lists
1228:shock
1094:IIIAB
964:Lunar
894:IIICD
754:group
745:class
578:S2CID
438:S2CID
344:China
318:秋本 俊一
151:Color
42:group
1423:stub
1321:type
1215:and
1100:IIIF
1097:IIIE
1074:IIAB
1063:Iron
982:List
757:and
750:clan
741:type
694:Find
667:Fall
643:and
570:PMID
1233:TKW
1107:IVB
1103:IVA
1090:IIG
1085:IIE
1081:IID
1078:IIC
937:HED
889:IAB
739:By
655:...
562:doi
558:346
531:doi
527:277
428:doi
293:in
265:).
112:: (
71:Aki
1468::
1070:IC
845:LL
819:EL
816:EH
803:CV
800:CR
797:CO
794:CM
791:CK
787:CI
783:CH
780:CB
752:,
743:,
576:.
568:.
556:.
552:.
525:.
521:.
487:.
469:.
450:^
436:.
426:.
416:85
414:.
410:.
366:.
362:,
354:,
350:,
342:,
338:,
334:,
107:)
1454:e
1447:t
1440:v
1429:.
840:L
835:H
747:,
633:e
626:t
619:v
584:.
564::
537:.
533::
506:.
491:.
473:.
444:.
430::
422::
321:)
315:(
307:3
279:3
275:3
263:3
255:3
234:3
130:3
127:R
116:)
114:3
105:3
59:3
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