40:
556:
575:
of the Earth, the transition would occur at ca. 6–7 GPa, i.e., at substantially lower pressure than the phase transitions of forsterite. In high-pressure experiments, the transformation may be delayed, so that it may remain stable to pressures of almost 35 GPa (see fig.), at which point it
450:
731:
D. C. Presnall (1995): Phase diagrams of Earth-forming minerals. In: Mineral
Physics & Crystallography – A Handbook of Physical Constants, ed. by T. J. Ahrens, AGU Reference Shelf vol. 2, American Geophysical Union, Washington, D.C., pp.
537:. Iron stabilizes the olivine + quartz pair. The pressure and compositional dependence of the reaction can be used to calculate constraints on pressures at which assemblages of olivine + quartz formed.
453:
The atomic scale structure of fayalite looking along the A axis. Oxygen is shown in red, silicon in pink, and iron in blue. A projection of the unit cell is shown by the black rectangle.
552:
of oxygen in laboratory experiments. It can also be used to calculate the fugacity of oxygen recorded by mineral assemblages in metamorphic and igneous processes.
789:
749:
96:
39:
784:
224:
529:
Fayalite is stable with quartz at low pressures, whereas more magnesian olivine is not, because of the reaction olivine +
257:
774:
769:
86:
548:+ quartz: the three minerals together make up the "FMQ" oxygen buffer. The reaction is used to control the
779:
764:
214:
655:
622:
572:
458:
563:
At high pressure, fayalite undergoes a phase transition to ahrensite, the iron-bearing analogue of
247:
237:
673:
204:
449:
745:
146:
720:
663:
523:
285:
267:
194:
65:
659:
693:
385:
106:
758:
677:
534:
307:
184:
118:
576:
may become amorphous rather than take on a crystalline structure such as ahrensite.
584:
393:
163:
111:
58:
564:
515:
397:
317:
133:
44:
Fayalite crystals on substrate. Sample collected from
Ochtendung, Eifel, Germany
600:
568:
493:
419:
125:
17:
612:
545:
511:
489:
477:
435:
431:
378:
567:, i.e., contrary to forsterite there is no intermediate form analogous to
418:
Fayalite forms solid solution series with the magnesium olivine endmember
179:
Greenish yellow, yellow-brown, brown; pale yellow to amber in thin section
549:
519:
500:
496:
481:
473:
469:
465:
327:
668:
643:
555:
616:
508:
485:
461:
389:
382:
708:
588:
541:
530:
504:
457:
Iron rich olivine is a relatively common constituent of acidic and
554:
448:
374:
742:
An introduction to the rock-forming minerals (2nd ed.)
694:
http://rruff.geo.arizona.edu/doclib/hom/fayalite.pdf
740:Deer, W. A., Howie, R. A., and Zussman, J. (1992).
526:iron-rich sediments and in impure carbonate rocks.
336:
326:
316:
306:
284:
276:
266:
256:
246:
236:
223:
213:
203:
193:
183:
175:
162:
157:
145:
132:
117:
105:
95:
85:
64:
54:
49:
32:
27:Iron end-member of olivine, a nesosilicate mineral
559:Molar volume vs. pressure at room temperature
8:
522:. It also occurs in medium-grade thermally
332:Measured: 74° to 47°, Calculated: 54° to 66°
388:series. In common with all minerals in the
689:
687:
667:
571:; under the conditions prevailing in the
704:
702:
634:
591:where it was first described in 1840.
189:Commonly granular, compact, or massive
29:
7:
644:"IMA–CNMNC approved mineral symbols"
709:http://www.mindat.org/min-1458.html
25:
242:Vitreous to resinous on fractures
153:c = 6.0889 ; Z = 4
38:
392:, fayalite crystallizes in the
209:{010} moderate, {100} imperfect
492:. Its main occurrence is in
1:
540:Fayalite can also react with
507:plutonic rocks and rarely in
488:where it is associated with
721:Fayalite data on Webmineral
503:rocks and less commonly in
199:On ; also on , as trillings
806:
790:Minerals in space group 62
369:, commonly abbreviated to
37:
615:-rich end-member of the
151:a = 4.8211, b = 10.4779
464:rocks such as volcanic
434:rich olivine endmember
403:) with cell parameters
696:Handbook of Mineralogy
648:Mineralogical Magazine
619:solid-solution series.
587:(Fayal) Island in the
560:
454:
785:Orthorhombic minerals
558:
452:
97:Strunz classification
623:Mineral redox buffer
514:. It also occurs in
430:) and also with the
669:10.1180/mgm.2021.43
660:2021MinM...85..291W
642:Warr, L.N. (2021).
744:. Harlow: Longman
561:
455:
277:Optical properties
123:Dipyramidal (mmm)
775:Iron(II) minerals
343:
342:
312:δ = 0.042 – 0.051
298:= 1.760 – 1.864 n
294:= 1.731 – 1.824 n
16:(Redirected from
797:
733:
729:
723:
718:
712:
706:
697:
691:
682:
681:
671:
639:
583:is derived from
368:
367:
366:
358:
357:
286:Refractive index
268:Specific gravity
229:
170:
71:
70:(repeating unit)
42:
30:
21:
805:
804:
800:
799:
798:
796:
795:
794:
755:
754:
737:
736:
730:
726:
719:
715:
707:
700:
692:
685:
641:
640:
636:
631:
610:
606:
597:
445:
441:
429:
425:
365:
362:
361:
360:
356:
353:
352:
351:
349:
302:= 1.773 – 1.875
301:
297:
293:
227:
168:
152:
128:: (2/m 2/m 2/m)
124:
81:
77:
69:
68:
45:
28:
23:
22:
15:
12:
11:
5:
803:
801:
793:
792:
787:
782:
777:
772:
770:Iron compounds
767:
757:
756:
753:
752:
735:
734:
724:
713:
698:
683:
654:(3): 291–320.
633:
632:
630:
627:
626:
625:
620:
608:
604:
596:
593:
443:
439:
427:
423:
386:solid-solution
363:
354:
341:
340:
338:
334:
333:
330:
324:
323:
320:
314:
313:
310:
304:
303:
299:
295:
291:
288:
282:
281:
278:
274:
273:
270:
264:
263:
260:
254:
253:
250:
244:
243:
240:
234:
233:
230:
221:
220:
217:
211:
210:
207:
201:
200:
197:
191:
190:
187:
181:
180:
177:
173:
172:
166:
160:
159:
158:Identification
155:
154:
149:
143:
142:
136:
130:
129:
121:
115:
114:
109:
107:Crystal system
103:
102:
99:
93:
92:
89:
83:
82:
79:
75:
72:
62:
61:
56:
52:
51:
47:
46:
43:
35:
34:
26:
24:
14:
13:
10:
9:
6:
4:
3:
2:
802:
791:
788:
786:
783:
781:
780:Nesosilicates
778:
776:
773:
771:
768:
766:
765:Iron minerals
763:
762:
760:
751:
750:0-582-30094-0
747:
743:
739:
738:
728:
725:
722:
717:
714:
710:
705:
703:
699:
695:
690:
688:
684:
679:
675:
670:
665:
661:
657:
653:
649:
645:
638:
635:
628:
624:
621:
618:
614:
602:
599:
598:
594:
592:
590:
586:
582:
577:
574:
570:
566:
557:
553:
551:
547:
543:
538:
536:
535:orthopyroxene
532:
527:
525:
524:metamorphosed
521:
517:
513:
510:
506:
502:
498:
495:
491:
487:
483:
479:
475:
471:
467:
463:
460:
451:
447:
437:
433:
421:
416:
414:
410:
406:
402:
399:
395:
391:
390:olivine group
387:
384:
380:
376:
372:
347:
339:
335:
331:
329:
325:
321:
319:
315:
311:
309:
308:Birefringence
305:
289:
287:
283:
279:
275:
271:
269:
265:
261:
259:
255:
251:
249:
245:
241:
239:
235:
231:
226:
222:
218:
216:
212:
208:
206:
202:
198:
196:
192:
188:
186:
185:Crystal habit
182:
178:
174:
167:
165:
161:
156:
150:
148:
144:
140:
137:
135:
131:
127:
122:
120:
119:Crystal class
116:
113:
110:
108:
104:
100:
98:
94:
90:
88:
84:
73:
67:
63:
60:
57:
53:
48:
41:
36:
31:
19:
18:Iron silicate
741:
727:
716:
651:
647:
637:
580:
578:
573:upper mantle
562:
539:
528:
456:
417:
412:
411:10.48 Å and
408:
404:
400:
394:orthorhombic
370:
345:
344:
164:Formula mass
138:
112:Orthorhombic
59:Nesosilicate
565:ringwoodite
544:to produce
516:lithophysae
398:space group
318:Pleochroism
280:Biaxial (-)
262:Transparent
258:Diaphaneity
171: g·mol
134:Space group
759:Categories
711:Mindat.org
629:References
601:Forsterite
569:wadsleyite
494:ultramafic
490:amphiboles
478:phonolites
420:forsterite
379:end-member
337:References
225:Mohs scale
219:Conchoidal
126:H-M symbol
87:IMA symbol
678:235729616
613:magnesium
579:The name
546:magnetite
512:pegmatite
474:trachytes
470:rhyolites
466:obsidians
436:tephroite
432:manganese
373:) is the
232:6.5 – 7.0
147:Unit cell
595:See also
581:fayalite
550:fugacity
520:obsidian
501:plutonic
497:volcanic
486:syenites
482:plutonic
459:alkaline
415:6.09 Å.
407:4.82 Å,
396:system (
346:Fayalite
328:2V angle
228:hardness
215:Fracture
205:Cleavage
195:Twinning
141:(no. 62)
55:Category
33:Fayalite
732:248–268
656:Bibcode
617:olivine
611:), the
509:granite
484:quartz
462:igneous
383:olivine
381:of the
169:203.771
101:9.AC.05
66:Formula
50:General
748:
676:
589:Azores
542:oxygen
531:quartz
505:felsic
377:-rich
248:Streak
238:Luster
674:S2CID
603:, (Mg
585:Faial
322:Faint
272:4.392
252:White
176:Color
746:ISBN
499:and
480:and
476:and
401:Pbnm
375:iron
139:Pbnm
664:doi
607:SiO
518:in
446:).
442:SiO
438:(Mn
426:SiO
422:(Mg
359:SiO
78:SiO
761::
701:^
686:^
672:.
662:.
652:85
650:.
646:.
533:=
472:,
468:,
371:Fa
350:Fe
91:Fa
74:Fe
680:.
666::
658::
609:4
605:2
444:4
440:2
428:4
424:2
413:c
409:b
405:a
364:4
355:2
348:(
300:γ
296:β
292:α
290:n
80:4
76:2
20:)
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