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Vlasovite is colorless, pink, pale brown or silvery in reflected light and colourless in transmitted light. The border zones of large grains are light brown due to dust-like inclusions. It is transparent to translucent, with a white
412:(1905–1964), a Russian mineralogist and geochemist who studied the Lovozero massif, and who was the founder of the Institute of Mineralogy, Geochemistry, and Crystal Chemistry of Rare Elements, Moscow, Russia.
573:
Crystals have been found up to 15 cm long, but vlasovite occurs more commonly as irregularly shaped grains and aggregates. It shows distinct cleavage parallel to the plane containing the a and c
649:(Peralkaline rocks are deficient in aluminium but have sodium and potassium in excess of the amount needed to form feldspar). At the Lovozero Massif in Russia it is formed in areas of rock rich in
714:
693:
is the
Vavnbed Mountain, Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia, which is also a good locality for
944:
706:
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408:, in the Northern Region of Russia. The researchers who first identified it, R P Tikhonenkova and M E Kazakova, named it for
239:
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939:
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crystals. Other localities for vlasovite include the volcanic
Ascension Island, in the South Atlantic Ocean, the
436:
661:(metasomatic rocks composed of alkaline feldspar, sodic pyroxene and alkaline amphibole), by the replacement of
924:
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parameters are a = 11 Å, b = 10 Å, c = 8.5 Å and β = 100°, with 4 formula units per unit cell (Z = 4).
747:
586:
561:, but altered portions of the material fluoresce orange-yellow under both long-wave and short-wave
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581:, although twinning is uncommon. Vlasovite is a brittle mineral, with an irregular to conchoidal
765:
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a = 10.96 Å, b = 10.01 Å, c = 8.53 Å, alpha = 89.70°, beta = 100.40°, gamma = 90.48°
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Gobechiya, Pekov, Yu and
Pushcharovski (2003) Crystallography Reports 48-5:750
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to form a chain of composition . These chains of tetrahedra link together with
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705:. Type material is conserved for reference in two locations in Russia, the
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This article is about the mineral. For the followers of Andrey Vlasov, see
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a = 11.0390(5) Å, b = 10.0980(4) Å, c = 8.5677(4) Å, β = 100.313(1)°
420:
At temperatures below 29 °C the stable form of vlasovite is
813:
Gaines et al (1997) Dana’s New
Mineralogy Eighth Edition. Wiley
491:
More accurate values are given by various sources as follows.
447:
part of the structure is a chain composed of rings of four SiO
356:
Non-fluorescent, but altered material fluoresces yellow-orange
701:, Villedieu Township, Quebec and the Strange Lake Complex in
404:. It was discovered in 1961 at Vavnbed Mountain in the
911:
http://rruff.geo.arizona.edu/AMS/viewJmol.php?id=06176
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2/m. Most sources simply give it as monoclinic 2/m,
42:
Golden-amber vlasovite crystal frozen in cherry-red
681:, in addition to microcline, albite and eudialyte.
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466:to form a framework with channels extending along
504:a = 11.063 Å, b = 10.15 Å, c = 8.60 Å, β = 100.3°
498:a = 10.98 Å, b = 10.00 Å, c = 8.52 Å, β = 100.40°
341:, but dissolves easily in a mixture of HF and H
327:(x): colorless. (y): colorless. (z): colorless.
846:http://www.webmineral.com/data/Vlasovite.shtml
8:
194:Crystals rare; usually grains and aggregates
657:in the contact zone between pegmatites and
888:Canadian Mineralogist (2006) 44: 1349-1356
645:cavities in ejected blocks of peralkaline
605:, but it dissolves easily in a mixture of
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435:. Above 29 °C the stable form is
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713:in Moscow, and also in France, at the
257:Greasy; vitreous to pearly on cleavage
25:
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797:American Mineralogist (1961) 46:1202
736:"IMA–CNMNC approved mineral symbols"
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707:Saint Petersburg Mining Institute
593:2.97. It is nearly insoluble in
36:
665:. Associated minerals include
577:, and this plane can also be a
337:Nearly insoluble in HCl and HNO
204:Uncommon, with twin plane {010}
1:
629:Vlasovite is a late phase in
550:= 1.628, similar to those of
184:Usually colorless or brownish
711:Fersman Mineralogical Museum
473:. The channels contain the
454:linked by sharing a corner
961:
945:Minerals in space group 15
277:Transparent to translucent
18:
494:For the monoclinic cell:
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873:handbookofmineralogy.org
715:National School of Mines
530:, vitreous to pearly on
508:For the triclinic cell:
410:Kuzma Aleksevich Vlasov
224:Irregular to conchoidal
21:Russian Liberation Army
740:Mineralogical Magazine
353:Other characteristics
103:Strunz classification
469:, parallel to the c
940:Monoclinic minerals
761:10.1180/mgm.2021.43
752:2021MinM...85..291W
734:Warr, L.N. (2021).
569:Physical properties
115:Dana classification
930:Zirconium minerals
536:refractive indices
517:Optical properties
292:Optical properties
631:nepheline syenite
607:hydrofluoric acid
595:hydrochloric acid
557:Vlasovite is not
376:(chain silicate)
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214:Distinct on {010}
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639:Ascension Island
591:specific gravity
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390:chemical formula
301:Refractive index
283:Specific gravity
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141:Prismatic (2/m)
109:8/F.34-20 (8 ed)
107:9.DM.25 (10 ed)
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72:(repeating unit)
61:Silicate mineral
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16:Silicate mineral
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534:surfaces. The
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905:External links
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699:Kipawa Complex
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166:Identification
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125:Crystal system
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633:and syenitic
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611:sulfuric acid
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546:= 1.623 and N
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935:Inosilicates
908:
893:
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667:arfvedsonite
628:
575:crystal axes
572:
563:ultra-violet
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471:crystal axis
419:
369:
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176:425.54 g/mol
172:Formula mass
159:
29:
827:"Vlasovite"
625:Environment
599:nitric acid
559:fluorescent
526:and greasy
443:C2/c. The
441:space group
429:space group
388:, with the
374:inosilicate
323:Pleochroism
295:Biaxial (−)
273:Diaphaneity
155:Space group
919:Categories
721:References
717:in Paris.
685:Localities
651:microcline
643:miarolitic
635:pegmatites
609:, HF, and
579:twin plane
542:= 1.607, N
452:tetrahedra
437:monoclinic
372:is a rare
361:References
333:Solubility
313:= 1.623, N
309:= 1.607, N
240:Mohs scale
146:H-M symbol
130:Monoclinic
93:IMA symbol
770:235729616
663:eudialyte
552:muscovite
487:unit cell
481:Unit cell
464:octahedra
460:zirconium
422:triclinic
416:Structure
386:zirconium
370:Vlasovite
44:eudialyte
30:Vlasovite
844:Webmin:
709:and the
703:Labrador
679:fluorite
671:aegirine
597:HCl and
587:hardness
583:fracture
532:cleavage
445:silicate
243:hardness
230:Tenacity
220:Fracture
210:Cleavage
200:Twinning
119:66.2.2.1
57:Category
748:Bibcode
675:apatite
659:fenites
647:granite
378:mineral
317:= 1.628
234:Brittle
68:Formula
52:General
909:JMol:
869:"Home"
768:
695:zircon
655:albite
637:. At
589:6 and
528:luster
524:streak
475:sodium
462:, Zr,
456:oxygen
382:sodium
263:Streak
253:Luster
144:(same
46:matrix
766:S2CID
538:are N
380:with
267:White
181:Color
689:The
677:and
653:and
485:The
396:ZrSi
384:and
287:2.97
160:B2/b
80:ZrSi
756:doi
601:HNO
97:Vsv
921::
881:^
871:.
852:^
835:^
818:^
802:^
778:^
764:.
754:.
744:85
742:.
738:.
673:,
669:,
621:.
617:SO
585:,
554:.
427:,
402:11
392:Na
345:SO
86:11
76:Na
875:.
829:.
772:.
758::
750::
619:4
615:2
613:H
603:3
548:z
544:y
540:x
449:4
433:1
431:P
425:1
400:O
398:4
394:2
347:4
343:2
339:3
315:z
311:y
307:x
305:N
247:6
148:)
84:O
82:4
78:2
23:.
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