583:. The calculated value varies from 68° to 88°. The direction perpendicular to the plane containing the two optic axes is called the optical direction Y. In magnesiohastingsite Y is parallel to the b crystal axis. The optical direction Z lies in the plane containing the two optic axes and bisects the angle between them. In magnesiohastingsite the angle between Z and the c crystal axis is 15° to 19°. If the color of the incident light is changed, then the refractive indices are modified, and the value of 2V changes. This is known as dispersion of the
26:
481:
511:. The inner tetrahedra are referred to as T1 and the outer ones as T2. The pattern in the double chain repeats after a block of two T1 and two T2 tetrahedra, with a repeat distance of approximately 5.3 Å, and this determines the length of the unit cell along the c
579:
crystal. Measured values of 2V for this mineral vary widely from about 60° to 90°. It is also possible to calculate a theoretical value of 2V from the measured values of the
1026:
92:
527:
The mineral is subopaque and vitreous, green to dark green or black in color and with a pale grey-green to pale brownish-green
472:(Z = 2). The unit cell parameters both for natural and for synthetic material are a = 9.9 Å, b = 18.0 Å, c = 5.3 Å, β = 105°.
215:
930:
248:
1021:
515:. The tetrahedra within a chain all point outwards in the same direction, and the chains are linked back-to-back by
106:
641:
457:
1016:
587:. For magnesiohastingsite the effect is weak, with 2V larger for red light than for violet light (r>v).
637:
584:
572:
205:
757:
568:
871:
528:
358:
238:
228:
519:
to form I-beams. The I-beams themselves are then linked together to form the complete structure.
728:
708:
704:
601:
580:
536:
444:
437:
405:
362:
197:
191:
567:(the difference in refractive index between light travelling through the crystal with different
625:
621:
512:
604:
is good with cleavage surfaces intersecting at about 56° and 124°, as is common with all the
617:
609:
258:
181:
55:
831:
480:
784:
620:
3.2, with increasing magnesium content causing a decrease in specific gravity. It is not
370:
1002:
116:
1010:
613:
576:
564:
532:
128:
668:
423:
357:
iron Fe, but the ideal formula features only ferric iron. It was named in 1928 by
163:
25:
780:
688:
649:
590:
465:
461:
349:
864.69 g. In synthetic magnesiohastingsite it appears that iron occurs both as
318:
146:
753:
724:
684:
605:
496:
399:
392:
385:
346:
314:
276:
137:
121:
31:
696:
657:
560:
469:
430:
381:
366:
310:
48:
571:) is δ = 0.012 to 0.033. The optic angle 2V is the angle between the two
773:
716:
676:
645:
955:
492:
The structure of all amphiboles is based on a double chain of linked SiO
369:
content. Hastingsite was named for the locality in
Dungannon Township,
777:
763:
712:
700:
692:
672:
516:
416:
350:
306:
897:
680:
660:
653:
354:
767:
479:
946:
Gaines et al (1997) Dana’s New
Mineralogy Eighth Edition. Wiley
921:
Deer, Howie and
Zussman (1997) Rock-forming minerals V2B:234-601
740:
734:
664:
563:
content causes a decrease in refractive indices. The maximum
593:
is variable in green, yellow-green, bluish-green and brown.
612:
parallel to a prism face. It is a brittle mineral, with
196:
Good on {110} with intersections at about 56° and 124°.
809:
1003:
http://rruff.geo.arizona.edu/AMS/viewJmol.php?id=11242
719:
and related calcium-rich rocks. Localities include:
293:
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257:
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237:
227:
214:
204:
190:
180:
172:
162:
157:
145:
127:
115:
105:
91:
54:
44:
39:
18:
971:Semet, M P (1973) American Mineralogist 58:480-494
989:Billings, M P (1928) American Mineralogist 13:287
376:Calcic (containing calcium) amphiboles include:
186:Simple or multiple twinning parallel to {100}
8:
551:= 1.666 to 1.706. Synthetic material has n
608:. The mineral displays simple or multiple
893:
891:
889:
887:
885:
883:
881:
879:
827:
825:
823:
821:
819:
817:
985:
983:
981:
979:
977:
797:
361:. The name is for its relationship to
967:
965:
963:
942:
940:
938:
867:
865:
863:
861:
859:
707:and the magnesium-rich members of the
321:(chain silicate) with the formula NaCa
243:Pale grey-green to pale brownish-green
15:
917:
915:
913:
911:
909:
907:
905:
857:
855:
853:
851:
849:
847:
845:
843:
841:
839:
805:
803:
801:
7:
468:C2/m. It has two formula units per
648:, Quebec, Canada. It is common in
559:= 1.653 to 1.672. An increase in
539:for natural material in the range n
456:Magnesiohastingsite belongs to the
14:
34:, Slovakia. Specimen size 4.5 cm
24:
783:in the Mount Hilliers complex,
679:. Associated minerals include
411:The hornblende group includes:
1:
749:Japan, where it is widespread
176:Green to dark green or black
632:Occurrence and associations
1043:
1027:Minerals in space group 12
760:batholiths, California, US
443:The magnesiosadanagaite –
436:The magnesiohastingsite –
426:– ferrotschermakite series
642:Canadian National Railway
458:monoclinic crystal system
402:– ferro-kaersutite series
388:– ferro-actinolite series
30:Magnesiohastingsite from
23:
433:– ferro-pargasite series
787:, Garfield County, Utah
624:and it is insoluble in
872:Handbook of Mineralogy
733:The Swiss and Italian
663:. It is also found in
499:, with composition (Si
489:
419:– ferro-edenite series
483:
286:Other characteristics
93:Strunz classification
313:and a member of the
1022:Monoclinic minerals
711:group are found in
597:Physical properties
555:= 1.642 to 1.657, n
547:= 1.661 to 1.695, n
543:= 1.652 to 1.676, n
484:Double Chain of SiO
373:, Ontario, Canada.
359:Marland P. Billings
303:Magnesiohastingsite
107:Dana classification
19:Magnesiohastingsite
746:Finland and Sweden
743:Mountains, Germany
729:Scottish Highlands
581:refractive indices
537:refractive indices
523:Optical properties
490:
268:Optical properties
626:hydrochloric acid
300:
299:
141:
101:
100:8/F.10-130 (8 ed)
1034:
990:
987:
972:
969:
958:
953:
947:
944:
933:
928:
922:
919:
900:
895:
874:
869:
834:
829:
812:
807:
618:specific gravity
317:group. It is an
281:Insoluble in HCl
259:Specific gravity
220:
135:
133:Prismatic (2/m)
99:
97:9.DE.15 (10 ed)
61:
60:(repeating unit)
28:
16:
1042:
1041:
1037:
1036:
1035:
1033:
1032:
1031:
1017:Amphibole group
1007:
1006:
999:
994:
993:
988:
975:
970:
961:
956:IMA Master List
954:
950:
945:
936:
931:Mineralienatlas
929:
925:
920:
903:
896:
877:
870:
837:
832:Webmineral data
830:
815:
808:
799:
794:
785:Henry Mountains
634:
599:
558:
554:
550:
546:
542:
525:
510:
506:
502:
495:
487:
478:
454:
371:Hastings County
353:iron Fe and as
344:
340:
336:
332:
328:
324:
289:Not radioactive
218:
200:on {001}, {100}
134:
98:
87:
83:
79:
75:
71:
67:
59:
58:
35:
12:
11:
5:
1040:
1038:
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1024:
1019:
1009:
1008:
998:
997:External links
995:
992:
991:
973:
959:
948:
934:
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901:
875:
835:
813:
810:RRUFF.info/ima
796:
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158:Identification
155:
154:
149:
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125:
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119:
117:Crystal system
113:
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1004:
996:
986:
984:
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980:
978:
974:
968:
966:
964:
960:
957:
952:
949:
943:
941:
939:
935:
932:
927:
924:
918:
916:
914:
912:
910:
908:
906:
902:
899:
894:
892:
890:
888:
886:
884:
882:
880:
876:
873:
868:
866:
864:
862:
860:
858:
856:
854:
852:
850:
848:
846:
844:
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840:
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833:
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824:
822:
820:
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814:
811:
806:
804:
802:
798:
791:
786:
782:
779:
775:
771:
769:
766:, Sweden, in
765:
762:
759:
758:Sierra Nevada
755:
752:The Southern
751:
748:
745:
742:
738:
736:
732:
730:
726:
723:The granitic
722:
721:
720:
718:
714:
710:
706:
702:
698:
694:
690:
686:
682:
678:
674:
670:
666:
662:
659:
655:
651:
647:
643:
639:
638:type locality
631:
629:
627:
623:
619:
615:
614:Mohs hardness
611:
607:
603:
596:
594:
592:
588:
586:
582:
578:
574:
570:
569:polarizations
566:
565:birefringence
562:
538:
534:
530:
522:
520:
518:
514:
498:
482:
475:
473:
471:
467:
463:
459:
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446:
442:
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435:
432:
428:
425:
421:
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414:
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401:
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378:
377:
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372:
368:
364:
360:
356:
352:
348:
320:
316:
312:
308:
304:
296:
292:
288:
284:
280:
278:
274:
270:
266:
262:
260:
256:
252:
250:
246:
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236:
232:
230:
226:
222:
217:
213:
209:
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203:
199:
195:
193:
189:
185:
183:
179:
175:
171:
167:
165:
161:
156:
153:
150:
148:
144:
139:
132:
130:
129:Crystal class
126:
123:
120:
118:
114:
110:
108:
104:
96:
94:
90:
63:
57:
53:
50:
47:
43:
38:
33:
27:
22:
17:
1000:
951:
926:
669:granodiorite
665:welded tuffs
635:
600:
589:
526:
513:crystal axis
491:
455:
424:tschermakite
410:
375:
309:-containing
302:
301:
263:3.16 to 3.22
168:864.69 g/mol
164:Formula mass
151:
111:66.01.03a.14
709:hastingsite
705:Barkevikite
689:plagioclase
650:amphibolite
622:radioactive
616:5 to 6 and
591:Pleochroism
533:biaxial (-)
466:space group
462:point group
445:sadanagaite
438:hastingsite
406:Joesmithite
363:hastingsite
319:inosilicate
271:Biaxial (-)
249:Diaphaneity
147:Space group
1011:Categories
898:Mindat.org
792:References
754:California
725:batholiths
685:orthoclase
658:pegmatitic
640:is in the
606:amphiboles
585:optic axes
573:optic axes
497:tetrahedra
488:Tetrahedra
400:kaersutite
393:hornblende
386:actinolite
347:molar mass
315:hornblende
294:References
277:Solubility
216:Mohs scale
138:H-M symbol
122:Monoclinic
32:Bratislava
697:magnetite
561:magnesium
531:. It is
476:Structure
470:unit cell
452:Unit cell
431:pargasite
382:tremolite
367:magnesium
311:amphibole
253:Subopaque
49:Amphibole
781:porphyry
774:xenolith
717:essexite
677:tonalite
646:Montreal
644:tunnel,
610:twinning
602:Cleavage
365:and its
233:Vitreous
219:hardness
206:Tenacity
198:Partings
192:Cleavage
182:Twinning
45:Category
778:diorite
764:Langban
727:of the
713:diorite
701:apatite
693:biotite
673:granite
577:biaxial
517:cations
417:edenite
351:ferrous
307:calcium
210:Brittle
56:Formula
40:General
1001:Jmol:
681:quartz
661:gabbro
654:schist
529:streak
447:series
440:series
355:ferric
329:Fe)(Si
239:Streak
229:Luster
223:5 to 6
136:(same
72:Fe)(Si
772:In a
768:skarn
575:in a
535:with
464:2/m,
395:group
305:is a
173:Color
756:and
741:Harz
739:The
735:Alps
699:and
675:and
656:and
636:The
429:The
422:The
415:The
398:The
391:The
380:The
345:and
341:(OH)
152:C2/m
84:(OH)
64:NaCa
776:in
325:(Mg
68:(Mg
1013::
976:^
962:^
937:^
904:^
878:^
838:^
816:^
800:^
715:,
703:.
695:,
691:,
687:,
683:,
671:,
667:,
652:,
628:.
505:11
460:,
384:–
339:22
337:)O
333:Al
82:22
80:)O
76:Al
557:γ
553:α
549:γ
545:β
541:α
509:n
507:)
503:O
501:4
494:4
486:4
343:2
335:2
331:6
327:4
323:2
140:)
86:2
78:2
74:6
70:4
66:2
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