366:
336:
562:
29:
577:
549:
refractories or 55–60% alumina bricks. However, it has mostly been replaced by the other aluminosilicate polymorphs, andalusite and kyanite, for this purpose. As of 1998, sillimanite was just 2% of all aluminosilicate mineral production in the western world.
811:
335:
925:
598:
165:
Colourless or white to grey, also brown, yellow, yellow-green, grey-green, blue-green, blue; colourless in thin section
854:
799:
740:
440:
82:
920:
534:
373:
210:
243:
935:
930:
533:. It was named by the State Legislature in 1977 as the state mineral of Delaware by the suggestion of the
910:
530:
756:
Whitney, D.L. (2002). "Coexisting andalusite, kyanite, and sillimanite: Sequential formation of three Al
561:
872:"Utilisation of sillimanite minerals, their geology, and potential occurrences in Norway – an overview"
92:
732:
815:
72:
915:
141:
459:
or even by the naked eye. Both the fibrous and traditional forms of sillimanite are common in
455:, so named because the mineral appears like a bunch of fibres twisted together when viewed in
200:
190:
724:
637:
425:
695:
8:
725:
576:
233:
223:
871:
641:
846:
764:
polymorphs during progressive metamorphism near the triple point, Sivrihisar, Turkey".
655:
526:
479:
180:
850:
795:
736:
659:
421:
842:
773:
645:
593:
463:
409:
271:
253:
51:
603:
437:
402:
386:
673:
102:
904:
467:
293:
170:
114:
511:
460:
456:
107:
44:
777:
470:
indicating high temperature but variable pressure. Example rocks include
303:
129:
650:
625:
365:
147:
487:
444:
350:
121:
710:
568:
519:
507:
483:
475:
28:
503:
313:
546:
515:
491:
448:
424:(1779–1864). It was first described in 1824 for an occurrence in
405:
343:
827:
Delaware State
Mineral, Sillimanite, Delaware Geological Survey
499:
495:
471:
837:
696:
http://rruff.geo.arizona.edu/doclib/hom/sillimanite.pdf
545:
Natural sillimanite is used in the manufacture of high
812:"Delaware State Mineral – Delaware Geological Survey"
731:. Essex: Longman Scientific & Technical. p.
420:. Sillimanite is named after the American chemist
722:
902:
790:Klein, Cornelis and Cornelius S. Hurlbut, Jr.,
727:Atlas of rock-forming minerals in thin section
451:. A common variety of sillimanite is known as
691:
689:
364:
27:
836:
649:
436:Sillimanite or fibrolite is one of three
706:
704:
755:
723:MacKenzie, W. S.; Guilford, C. (1980).
686:
903:
478:. It occurs with andalusite, kyanite,
355:
348:
341:
869:
701:
518:are similar mineral species found in
175:Prismatic crystals, fibrous, acicular
879:Geological Survey of Norway Bulletin
784:
626:"IMA–CNMNC approved mineral symbols"
623:
711:http://www.mindat.org/min-3662.html
599:List of minerals named after people
13:
847:10.1016/B978-0-08-020430-7.50027-X
606:, which is also called "fibrolite"
308:Colourless to pale brown to yellow
14:
947:
839:Fuels, Furnaces and Refractories
575:
560:
334:
228:Vitreous to subadamantine, silky
152:c = 5.75 Å; Z = 4
863:
830:
804:
749:
716:
666:
617:
535:Delaware Mineralogical Society
525:Sillimanite has been found in
1:
794:1985, Wiley 20th ed., p. 380
610:
431:
7:
587:
531:New Castle County, Delaware
10:
952:
926:Minerals in space group 62
553:
248:Transparent to translucent
322:
312:
302:
292:
270:
262:
252:
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222:
209:
199:
189:
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169:
161:
156:
140:
128:
113:
101:
91:
81:
71:
50:
40:
35:
26:
21:
870:Ihlen, Peter M. (2000).
567:Silimanite crystal from
540:
698:Handbook of Mineralogy
630:Mineralogical Magazine
443:, the other two being
921:Orthorhombic minerals
792:Manual of Mineralogy,
766:American Mineralogist
83:Strunz classification
778:10.2138/am-2002-0404
582:Fibrolite micrograph
426:Chester, Connecticut
16:Nesosilicate mineral
936:Symbols of Delaware
931:Industrial minerals
651:10.1180/mgm.2021.43
642:2021MinM...85..291W
624:Warr, L.N. (2021).
506:and also rarely in
376:Phase diagram of Al
93:Dana classification
911:Aluminium minerals
674:"WebMineral entry"
527:Brandywine Springs
480:potassium feldspar
263:Optical properties
150:, b = 7.66 Å
119:Dipyramidal (mmm)
464:sedimentary rocks
422:Benjamin Silliman
329:
328:
298:δ = 0.020 – 0.022
284:= 1.654 – 1.670 n
280:= 1.653 – 1.661 n
943:
895:
894:
892:
890:
876:
867:
861:
860:
834:
828:
826:
824:
823:
814:. Archived from
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753:
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730:
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714:
708:
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693:
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621:
594:List of minerals
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564:
410:chemical formula
387:aluminosilicates
368:
360:
353:
346:
338:
272:Refractive index
254:Specific gravity
215:
57:
56:(repeating unit)
31:
19:
18:
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950:
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945:
944:
942:
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743:
721:
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667:
622:
618:
613:
604:Asbestos cement
590:
583:
580:
571:
565:
556:
543:
438:aluminosilicate
434:
419:
415:
403:aluminosilicate
392:
391:
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384:
383:
379:
375:
370:
369:
362:
361:
356:
354:
349:
347:
342:
339:
288:= 1.669 – 1.684
287:
283:
279:
213:
151:
124:: (2/m 2/m 2/m)
120:
67:
63:
55:
54:
17:
12:
11:
5:
949:
939:
938:
933:
928:
923:
918:
913:
897:
896:
862:
855:
829:
803:
783:
772:(4): 405–416.
761:
757:
748:
741:
715:
700:
685:
665:
636:(3): 291–320.
615:
614:
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609:
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572:
566:
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539:
433:
430:
417:
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381:
377:
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363:
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157:Identification
154:
153:
146:a = 7.47
144:
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103:Crystal system
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24:
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15:
9:
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4:
3:
2:
948:
937:
934:
932:
929:
927:
924:
922:
919:
917:
916:Nesosilicates
914:
912:
909:
908:
906:
884:
880:
873:
866:
858:
856:9780080204307
852:
848:
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840:
833:
818:on 2010-06-10
817:
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801:
800:0-471-80580-7
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744:
742:0-582-45591-X
738:
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728:
719:
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675:
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652:
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631:
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532:
528:
523:
521:
517:
513:
509:
505:
501:
497:
493:
489:
485:
481:
477:
473:
469:
468:index mineral
465:
462:
461:metamorphosed
458:
454:
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439:
429:
427:
423:
411:
407:
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396:
388:
374:
367:
359:
352:
345:
337:
325:
321:
317:
315:
311:
307:
305:
301:
297:
295:
294:Birefringence
291:
275:
273:
269:
265:
261:
257:
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231:
227:
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217:
212:
208:
204:
202:
198:
194:
192:
188:
185:{010} perfect
184:
182:
178:
174:
172:
171:Crystal habit
168:
164:
160:
155:
149:
145:
143:
139:
136:
133:
131:
127:
123:
118:
116:
115:Crystal class
112:
109:
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90:
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84:
80:
76:
74:
70:
59:
53:
49:
46:
43:
39:
34:
30:
25:
20:
887:. Retrieved
882:
878:
865:
838:
832:
820:. Retrieved
816:the original
806:
791:
786:
769:
765:
751:
726:
718:
677:. Retrieved
668:
633:
629:
619:
544:
524:
512:Dumortierite
457:thin section
452:
435:
398:
394:
393:
357:
134:
108:Orthorhombic
97:52.02.02a.01
45:Nesosilicate
841:: 258–272.
466:. It is an
395:Sillimanite
358:Sillimanite
304:Pleochroism
266:Biaxial (+)
244:Diaphaneity
130:Space group
22:Sillimanite
905:Categories
822:2009-12-19
713:Mindat.org
679:2009-12-19
611:References
508:pegmatites
502:, gneiss,
488:cordierite
445:andalusite
441:polymorphs
432:Occurrence
351:Andalusite
323:References
211:Mohs scale
122:H-M symbol
73:IMA symbol
660:235729616
569:Sri Lanka
520:porcelain
484:almandine
476:granulite
453:fibrolite
408:with the
399:fibrolite
195:Splintery
142:Unit cell
889:14 March
588:See also
504:hornfels
314:2V angle
214:hardness
201:Tenacity
191:Fracture
181:Cleavage
41:Category
638:Bibcode
554:Gallery
547:alumina
516:mullite
492:biotite
449:kyanite
406:mineral
344:Kyanite
87:9.AF.05
52:Formula
36:General
853:
798:
739:
658:
500:schist
496:quartz
472:gneiss
401:is an
318:21–30°
234:Streak
224:Luster
885:: 113
875:(PDF)
656:S2CID
238:White
205:Tough
162:Color
891:2022
851:ISBN
796:ISBN
737:ISBN
541:Uses
514:and
494:and
474:and
447:and
258:3.24
135:Pbnm
883:436
843:doi
774:doi
760:SiO
646:doi
498:in
416:SiO
397:or
380:SiO
77:Sil
64:SiO
907::
881:.
877:.
849:.
770:87
768:.
735:.
733:10
703:^
688:^
654:.
644:.
634:85
632:.
628:.
537:.
529:,
522:.
510:.
490:,
486:,
482:,
428:.
412:Al
389:).
60:Al
893:.
859:.
845::
825:.
780:.
776::
762:5
758:2
745:.
682:.
662:.
648::
640::
418:5
414:2
385:(
382:5
378:2
286:γ
282:β
278:α
276:n
218:7
148:Å
66:5
62:2
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