398:
29:
300:
390:
420:. It is also known to occur as small grains in detrital sands. Crystals are rare, but when found can produce nicely shaped short prismatic crystals with pyramidal terminations. It is commonly associated with
489:
varies from 4.4 to 6.6 g/cm. Hardness is 4.5 and the luster is vitreous or resinous. The color is normally black, but can range from brownish black to orange, yellowish-orange and dark green.
730:
459:, Canada. Other varieties of thorite include "orangite", an orange variety, and "calciothorite", an impure variety with trace amounts of
735:
455:. A variety of thorite, often called "uranothorite", is particularly rich in uranium and has been a viable uranium ore at Bancroft in
81:
720:
662:
198:
710:
342:
231:
725:
397:
705:
96:
71:
715:
366:
188:
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635:
519:
370:
221:
211:
537:
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326:
135:
643:
604:
527:
486:
417:
259:
241:
54:
47:
478:
473:
639:
523:
91:
624:"Untersuchung eines neuen Minerals und einer darin enthaltenen zuvor unbekannten Erde"
579:
699:
541:
377:, who was a professor of mineralogy and geology. It was named in 1829 to reflect its
362:
277:
158:
103:
406:
677:
433:
374:
303:
118:
33:
Thorite crystal from the Kemp uranium mine in
Ontario (size: 2.2 x 2.2 x 1.6 cm)
608:
445:
441:
429:
338:
110:
647:
482:
437:
409:
28:
554:
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532:
507:
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460:
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452:
378:
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663:"Rediscovery of the Elements- Thorium-Løvøya, Langesundsfjord, Norway"
565:
421:
350:
346:
623:
592:
389:
485:
and optically isotropic. Owing to differences in composition, the
396:
388:
471:
Due to the radioactive elements contained, Thorite is commonly
163:
In square prisms, or pseudo-octahedral crystals; also massive
153:
Yellow-orange, brownish yellow, brownish black, black, green
226:
Light orange to light brown sometimes even an alien magenta
477:. With the destructive effects of radioactivity on the
373:. First specimens of Thorite were sent to his father,
401:
Small crystals of green thorite under magnification
309:
294:
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117:
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53:
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38:
21:
593:"Thorite, a new mineral, and thorina, a new earth"
365:. Thorite was discovered in 1828 on the island of
416:extrusive rocks, hydrothermal veins and contact
8:
236:Nearly opaque, transparent in thin fragments
531:
451:Thorite is currently an important ore of
405:Specimens of thorite generally come from
369:, Norway, by the vicar and mineralogist,
140:a = 7.13, c = 6.32 ; Z = 4
661:Marshall, J.L.; Marshall, V.R. (2001).
498:
18:
575:
573:
7:
508:"IMA–CNMNC approved mineral symbols"
14:
393:Thorite in Prague national museum
108:Ditetragonal dipyramidal (4/mmm)
298:
27:
481:, hydrated specimens are often
361:and is nearly always strongly
1:
628:Annalen der Physik und Chemie
731:Minerals in space group 141
752:
736:Minerals described in 1829
622:Berzelius, J. J. (1829).
609:10.1080/14786442908675174
371:Hans Morten Thrane Esmark
26:
648:10.1002/andp.18290920702
353:. It is the most common
676:: 70–73. Archived from
597:Philosophical Magazine
591:Berzelius, M. (1829).
580:Handbook of Mineralogy
512:Mineralogical Magazine
402:
394:
721:Radioactive gemstones
400:
392:
295:Other characteristics
82:Strunz classification
711:Uranium(IV) minerals
216:Vitreous to resinous
16:Nesosilicate mineral
726:Tetragonal minerals
640:1829AnP....92..385B
533:10.1180/mgm.2021.43
524:2021MinM...85..291W
506:Warr, L.N. (2021).
403:
395:
251:Optical properties
418:metamorphic rocks
316:
315:
290:Commonly metamict
282:δ = 0.010 – 0.020
268:= 1.790 – 1.840 n
173:Distinct on {110}
743:
706:Thorium minerals
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487:specific gravity
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260:Refractive index
242:Specific gravity
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60:
59:(repeating unit)
48:Silicate mineral
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19:
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603:(35): 392–393.
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555:Webmineral data
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479:crystal lattice
469:
387:
324:
272:= 1.780 – 1.820
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129:
113:: (4/m 2/m 2/m)
109:
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34:
17:
12:
11:
5:
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692:External links
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683:on 2005-04-08.
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634:(7): 385–415.
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518:(3): 291–320.
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341:system and is
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145:Identification
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92:Crystal system
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716:Nesosilicates
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278:Birefringence
275:
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159:Crystal habit
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104:Crystal class
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62:
56:
52:
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42:
37:
30:
25:
20:
678:the original
673:
669:
656:
631:
627:
617:
600:
599:. Series 2.
596:
586:
561:
550:
515:
511:
501:
472:
470:
450:
404:
335:crystallizes
327:nesosilicate
325:, is a rare
318:
317:
254:Uniaxial (−)
123:
670:The Hexagon
434:fergusonite
375:Jens Esmark
363:radioactive
343:isomorphous
321:, (Th,U)SiO
304:Radioactive
246:6.63 – 7.20
232:Diaphaneity
119:Space group
700:Categories
566:Mindat.org
493:References
467:Properties
446:pyrochlore
442:yttrialite
430:gadolinite
410:pegmatites
385:Occurrence
339:tetragonal
310:References
199:Mohs scale
183:Conchoidal
111:H-M symbol
97:Tetragonal
72:IMA symbol
542:235729616
483:amorphous
438:uraninite
381:content.
287:Alters to
136:Unit cell
63:(Th,U)SiO
474:metamict
426:monazite
414:volcanic
202:hardness
189:Tenacity
179:Fracture
169:Cleavage
44:Category
636:Bibcode
520:Bibcode
461:calcium
457:Ontario
453:uranium
407:igneous
379:thorium
359:thorium
355:mineral
337:in the
331:thorium
319:Thorite
206:4.5 – 5
193:Brittle
86:9.AD.30
55:Formula
39:General
22:Thorite
540:
422:zircon
367:Løvøya
351:hafnon
347:zircon
222:Streak
212:Luster
681:(PDF)
666:(PDF)
538:S2CID
345:with
333:that
150:Color
444:and
412:and
349:and
130:/amd
644:doi
605:doi
528:doi
357:of
329:of
76:Thr
702::
674:93
672:.
668:.
642:.
632:92
630:.
626:.
595:.
572:^
536:.
526:.
516:85
514:.
510:.
463:.
448:.
440:,
436:,
432:,
428:,
424:,
650:.
646::
638::
611:.
607::
601:6
544:.
530::
522::
323:4
270:ε
266:ω
264:n
128:1
126:4
124:I
65:4
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