26:
396:, i.e., "ferric dravite". However later investigations yielded a new empirical formula which had no relation to the dravite. This called for renaming, and the new name, after Pavel Povondra (1924–2013), a mineralogist at the
30:
The crystals here are black, lustrous, and 1-2mm in size. They richly cover one side of the matrix, and the povondraite winds its way through the fissures in the rock.
401:
587:
97:
223:
256:
397:
572:
567:
582:
107:
577:
562:
343:
87:
506:
213:
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592:
434:
339:
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452:
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150:
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49:
490:
438:
117:
556:
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381:
165:
543:
502:
338:
O. It is a dark brown to black nearly opaque mineral with a resinous to splendent
25:
137:
476:
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303:
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519:
447:
422:
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503:
Ferridravite, a new mineral of the tourmaline group from
Bolivia
346:
as equant, distorted prisms with trigonal pyramid terminations.
544:"Povondraite. a redefinition of the tourmaline ferridravite"
353:
derived from sedimentary rocks. Associated minerals include
349:
It occurs as rare fracture and cavity encrustations within
520:"Povondra, Pavel, 1924-2013 - Portaro - katalog knihovny"
546:, American Mineralogist, Volume 78, pages 433-436, 1993
392:, for the composition and the assumed relationship to
542:
Joel, D. Grice, T. Scott Encit, Frank C. Hawthorne,
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380:Discovered at the San Francisco mine, near
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446:
468:
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413:
402:International Mineralogical Association
15:
486:
484:
7:
423:"IMA–CNMNC approved mineral symbols"
388:, in 1976, originally it was called
14:
509:, Volume 64, pages 945-948, 1979
178:Dark brown to brown-black, black
1:
501:Kurt Valenta, Pete J. Dunn, "
398:Charles University in Prague
588:Minerals in space group 160
609:
342:. It crystallizes in the
306:group with formula: NaFe
289:K,Mg,Al,Cu,Pb,Sn,Ti,V,H2O
23:
344:trigonal crystal system
491:Handbook of Mineralogy
427:Mineralogical Magazine
400:, was approved by the
507:American Mineralogist
208:Irregular, conchoidal
98:Strunz classification
132:Hemimorphic trigonal
122:Hexagonal-Rhomboidal
448:10.1180/mgm.2021.43
439:2021MinM...85..291W
421:Warr, L.N. (2021).
384:(in Alto Chapare),
188:Prismatic, striated
108:Dana classification
573:Manganese minerals
568:Iron(III) minerals
359:potassium feldspar
583:Trigonal minerals
293:
292:
286:Common impurities
155:a=16.18Ă…, c=7.44Ă…
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300:silicate mineral
267:Refractive index
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55:
54:(repeating unit)
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16:
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578:Sodium minerals
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12:
11:
5:
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563:Cyclosilicates
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524:katalog.vsb.cz
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494:
480:
462:
433:(3): 291–320.
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404:in the 1990s.
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160:Identification
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118:Crystal system
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94:
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84:
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44:Cyclosilicates
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474:
473:"Povondraite"
469:
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277:Birefringence
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198:None observed
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184:Crystal habit
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128:Crystal class
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57:
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27:
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538:
527:. Retrieved
523:
514:
497:
430:
426:
416:
390:ferridravite
389:
382:Villa Tunari
379:
348:
295:
294:
166:Formula mass
142:
593:Tourmalines
296:Povondraite
271:1.74 - 1.82
261:Translucent
257:Diaphaneity
138:Space group
19:Povondraite
557:Categories
529:2021-03-19
477:Mindat.org
408:References
371:riebeckite
304:tourmaline
298:is a rare
224:Mohs scale
170:1156.50 gm
88:IMA symbol
457:235729616
375:magnesite
363:muscovite
302:from the
151:Unit cell
145:(No. 160)
102:8/E.19-75
241:Resinous
227:hardness
214:Tenacity
204:Fracture
194:Cleavage
112:61.3.1.6
82:)3(OH)3O
41:Category
435:Bibcode
394:dravite
386:Bolivia
351:schists
218:Brittle
50:Formula
36:General
455:
367:schorl
355:quartz
340:luster
247:Streak
237:Luster
175:Colour
70:+4)(Si
453:S2CID
281:0.069
251:Brown
62:+3(Mg
373:and
334:(OH)
318:)(BO
78:)(BO
58:NaFe
505:",
475:on
443:doi
314:,Mg
310:(Fe
143:R3m
92:Pov
559::
522:.
483:^
465:^
451:.
441:.
431:85
429:.
425:.
377:.
369:,
365:,
361:,
357:,
332:18
326:Si
76:18
66:Fe
532:.
459:.
445::
437::
336:3
330:O
328:6
324:3
322:)
320:3
316:2
312:4
308:3
231:7
80:3
74:O
72:6
68:3
64:2
60:3
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