26:
426:
of polybasite was called antimonpearceite. Arsenpolybasite was found to represent two different polytypes, arsenpolybasite-221 and arsenpolybasite-222. In modern usage the old name pearceite is replaced by the polytype name pearceite-Tac, arsenpolybasite-221 by pearceite-T2ac, arsenpolybasite-222 by
480:
Monoclinic variety: There are two formula units per unit cell (Z = 2), the lengths of the sides of the unit cell are a = 12.64 Å, b = 7.29 Å, c = 11.90 Å and the angle between the c and a directions is β =
484:
Trigonal variety: There is one formula unit per unit cell (Z = 1), two of the sides are of equal length a = 7.3876 Ă… and the third side, parallel to the threefold axis, is c = 11.8882 Ă….
985:
955:
1074:
1133:
96:
423:
703:
383:. It was discovered in 1896 and named after Dr Richard Pearce (1837–1927), a Cornish–American chemist and metallurgist from
216:
249:
1138:
1123:
1113:
1128:
399:
are closely related minerals that form the pearceite-polybasite series. Originally pearceite was thought to be an
110:
1118:
1103:
467:
440:
1108:
1071:
663:
651:
577:
444:
436:
427:
pearceite-M2a2b2c and antimonpearcite by polybasite-Tac. Pearceite-Tac forms a series with polybasite-Tac.
86:
541:
with bevelled edges, showing triangular striations on faces parallel to the plane containing the a and b
1023:"Temperature dependence of the silver distribution in the crystal structure of natural pearcite, (Ag,Cu)
631:
615:
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206:
196:
750:
592:
584:
1066:
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239:
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768:
186:
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997:
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627:
583:
Reflected light anisotropism is the property of appearing to change color when viewed under
565:
538:
277:
259:
55:
1078:
986:"The pearceite-polybasite group of minerals: Crystal chemistry and new nomenclature rules"
699:
659:
859:
754:
591:. Pearceite exhibits moderate anisotropism, often dark violet. The color in reflected
667:
120:
31:
549:
it is white with very dark red internal reflections. It has a black to reddish black
1097:
772:
679:
619:
573:
569:
561:
531:
287:
176:
1083:
858:
Anthony, John W.; Bideaux, Richard A.; Bladh, Kenneth W.; Nichols, Monte C. (2005).
545:, and rosettes of such crystals, to 3 cm across. The mineral is black, and in
675:
655:
600:
588:
546:
542:
158:
302:
RL Pleochroism (in reflected plane polarised light): Very weak in air, fair in oil
1088:
810:
639:
604:
596:
455:
346:
297:
136:
25:
931:
396:
374:
125:
1022:
683:
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360:
1001:
925:
635:
129:
763:
738:
702:, New Haven, Connecticut, references 3.4270, 3.4292, 3.4293, and at The
695:
623:
493:
400:
48:
691:
687:
515:
511:
504:
384:
896:
Gaines et al (1997) Dana’s New
Mineralogy, Eighth Edition. Wiley
595:
is white, with very dark red internal reflections and very weak
507:
530:
Pearceite is often granular and massive; crystals are short,
488:
The crystal structure consists of sheets stacked along the c
557:, generally opaque, but translucent in very thin fragments.
723:
443:, are known. The trigonal variety crystallizes in the
326:
is one of the four so-called "ruby silvers", pearceite
956:"Isodimorphism of the polybasite and pearceite series"
724:"IMA Mineral List with Database of Mineral Properties"
670:
formed at low to medium temperatures, associated with
984:
L. Bindi; M. Evain; P.G. Spry; S. Menchetti (2007).
466:
2/m 1). The monoclinic variety crystallises in the
314:
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119:
109:
95:
85:
54:
44:
39:
18:
634:is either absent or poor. The mineral is neither
610:Pearceite is a brittle mineral that breaks with a
1067:Nikon: Introduction to Polarized Light Microscopy
522:, 2,3 and 4, as is usually the case with silver.
603:in air at 540 nm is about 30%. It is not
310:Non-fluorescent, nonmagnetic, not radioactive
8:
518:cations are found in various sites with low
630:of 6.15, the highest of the ruby silvers.
662:, Aspen District (Roaring Fork District),
422:, and was called arsenpolybasite, and one
24:
1021:L. Bindi; M. Evain; S. Menchetti (2006).
804:
802:
762:
920:
918:
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949:
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626:. The silver content gives it a high
15:
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841:
839:
837:
835:
833:
831:
7:
739:"IMA–CNMNC approved mineral symbols"
706:, London, England, reference 84843.
1072:Olympus: Polarized Light Microscopy
14:
1089:A virtual Polarizing Microscope
698:. Type material is lodged at
666:, where the mineral occurs in
1:
470:2/m class, space group C2/m.
445:hexagonal scalenohedral class
431:Crystallography and Structure
1134:Minerals in space group 164
646:Occurrence and associations
1155:
589:reflected light microscope
435:Two structural varieties,
869:. Mineral Data Publishing
809:Barthelmy, David (2014).
23:
1039:Acta Crystallographica B
811:"Pearceite Mineral Data"
664:Pitkin County, Colorado
585:crossed polarised light
403:analogue of polybasite
201:Conchoidal to irregular
1084:Geological Microscopes
867:Handbook of Mineralogy
743:Mineralogical Magazine
704:Natural History Museum
599:in air, fair in oil.
580:is relatively strong.
181:Pseudohexagonal prisms
990:American Mineralogist
960:American Mineralogist
668:hydrothermal deposits
593:plane polarised light
307:Other characteristics
97:Strunz classification
1002:10.2138/am.2007.2440
622:only 3, the same as
618:. It is soft, with
568:of 2.7 and maximum
520:coordination numbers
496:atoms form isolated
1139:Monoclinic minerals
954:C. Frondel (1963).
764:10.1180/mgm.2021.43
755:2021MinM...85..291W
737:Warr, L.N. (2021).
111:Dana classification
1124:Aluminium minerals
1114:Copper(I) minerals
1077:2009-02-21 at the
656:Mollie Gibson Mine
269:Optical properties
1129:Trigonal minerals
564:with a very high
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320:
105:
1146:
1119:Arsenic minerals
1104:Sulfide minerals
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628:specific gravity
566:refractive index
547:polished section
502:
465:
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453:
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382:
372:
358:
344:
278:Refractive index
260:Specific gravity
221:
145:
104:2/E.05-20 (8 ed)
103:
101:2.GB.15 (10 ed)
81:
61:
60:(repeating unit)
28:
16:
1154:
1153:
1149:
1148:
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1109:Silver minerals
1094:
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1079:Wayback Machine
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700:Yale University
648:
553:and a metallic
528:
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219:
143:
102:
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68:
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35:
30:Pearceite from
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11:
5:
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1061:External links
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1024:
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966:(5–6): 565–572
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898:
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815:Webmineral.com
778:
749:(3): 291–320.
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708:
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527:
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514:atoms and the
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395:Pearceite and
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163:2,096.80 g/mol
161:
155:
154:
153:Identification
150:
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139:
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121:Crystal system
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730:
725:
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716:
709:
707:
705:
701:
697:
693:
689:
685:
681:
680:native silver
677:
673:
669:
665:
661:
657:
653:
652:type locality
645:
643:
641:
637:
633:
629:
625:
621:
617:
614:to irregular
613:
608:
606:
602:
598:
594:
590:
586:
581:
579:
575:
571:
570:birefringence
567:
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288:Birefringence
285:
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177:Crystal habit
174:
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84:
63:
57:
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50:
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43:
38:
34:, Montana, US
33:
27:
22:
17:
1047:. Retrieved
1042:
1038:
1016:
1005:. Retrieved
993:
989:
979:
968:. Retrieved
963:
959:
935:, retrieved
926:
871:. Retrieved
866:
818:. Retrieved
814:
746:
742:
732:
718:
676:tetrahedrite
649:
609:
601:Reflectivity
582:
572:δ also 2.7.
559:
529:
487:
472:
434:
394:
391:Nomenclature
387:, Colorado.
323:
322:
159:Formula mass
141:
19:Pearcbuteite
996:: 918–925.
860:"Pearceite"
640:radioactive
605:fluorescent
597:pleochroism
476:parameters
456:space group
347:pyrargyrite
298:Pleochroism
250:Diaphaneity
137:Space group
1098:Categories
1049:2024-07-01
1007:2024-07-01
970:2024-07-01
932:Mindat.org
710:References
612:conchoidal
578:optic axes
574:Dispersion
526:Properties
503:pyramids,
441:monoclinic
397:polybasite
375:miargyrite
315:References
217:Mohs scale
191:{001} Poor
126:Monoclinic
87:IMA symbol
1045:: 212–219
927:Pearceite
773:235729616
684:proustite
672:acanthite
536:hexagonal
510:link two
474:Unit cell
468:prismatic
405:Cu(Ag,Cu)
361:proustite
328:Cu(Ag,Cu)
324:Pearceite
148:(no. 164)
65:Cu(Ag,Cu)
1075:Archived
937:7 August
873:7 August
820:7 August
636:magnetic
632:Cleavage
620:hardness
616:fracture
498:(As,Sb)S
437:trigonal
424:polytype
234:Metallic
220:hardness
207:Tenacity
197:Fracture
187:Cleavage
130:trigonal
45:Category
1027:(As,Sb)
751:Bibcode
696:calcite
654:is the
624:calcite
576:of the
562:biaxial
532:tabular
508:cations
494:arsenic
492:. The
401:arsenic
272:Biaxial
211:Brittle
115:3.1.8.1
56:Formula
49:Mineral
40:General
771:
692:baryte
688:quartz
560:It is
555:luster
551:streak
539:prisms
534:pseudo
516:silver
512:sulfur
505:copper
481:90.0°.
454:2/m),
385:Denver
254:Opaque
240:Streak
230:Luster
863:(PDF)
769:S2CID
660:Aspen
587:in a
462:m1 (P
378:AgSbS
244:Black
171:Black
168:Color
32:Butte
939:2022
875:2022
822:2022
694:and
650:The
638:nor
543:axes
490:axis
439:and
373:and
264:6.15
998:doi
759:doi
450:m (
368:AsS
354:SbS
292:2.7
282:2.7
128:or
91:Pea
1100::
1043:62
1041:.
1037:.
1033:11
1025:16
994:92
992:.
988:.
964:48
962:.
958:.
946:^
930:,
901:^
883:^
865:.
830:^
813:.
781:^
767:.
757:.
747:85
745:.
741:.
690:,
686:,
682:,
678:,
674:,
658:,
642:.
607:.
419:11
413:Sb
409:Ag
364:Ag
359:,
350:Ag
345:,
342:11
336:As
332:Ag
146:m1
79:11
73:As
69:Ag
1052:.
1035:"
1031:S
1029:2
1010:.
1000::
973:.
877:.
824:.
775:.
761::
753::
726:.
500:3
464:3
460:3
458:P
452:3
448:3
417:S
415:2
411:9
407:6
380:2
370:3
366:3
356:3
352:3
340:S
338:2
334:9
330:6
224:3
144:3
142:P
77:S
75:2
71:9
67:6
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