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Bykovaite

A valid IMA mineral species
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04645970014974351057679.jpg
Bykovaite, etc.

Shkatulka pegmatite, Umbozero mine, Alluaiv Mountain, Lovozersky District, Murmansk Oblast, Russia
06908470014974351057897.jpg
Bykovaite, etc.

Shkatulka pegmatite, Umbozero mine, Alluaiv Mountain, Lovozersky District, Murmansk Oblast, Russia
07941620014974351057367.jpg
Bykovaite

Shkatulka pegmatite, Umbozero mine, Alluaiv Mountain, Lovozersky District, Murmansk Oblast, Russia
06285180014961538865864.jpg
Bykovaite, etc.

Shkatulka pegmatite, Umbozero mine, Alluaiv Mountain, Lovozersky District, Murmansk Oblast, Russia
02844810014947755757653.jpg
Bykovaite, etc.

Shkatulka pegmatite, Umbozero mine, Alluaiv Mountain, Lovozersky District, Murmansk Oblast, Russia
00175740014964799945271.jpg
Bykovaite

Shkatulka pegmatite, Umbozero mine, Alluaiv Mountain, Lovozersky District, Murmansk Oblast, Russia
04645970014974351057679.jpg
Bykovaite, etc.

Shkatulka pegmatite, Umbozero mine, Alluaiv Mountain, Lovozersky District, Murmansk Oblast, Russia
06908470014974351057897.jpg
Bykovaite, etc.

Shkatulka pegmatite, Umbozero mine, Alluaiv Mountain, Lovozersky District, Murmansk Oblast, Russia
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About BykovaiteHide

Formula:
(Ba,Na,K)2(Na,Ti,Mn)4(Ti,Nb)2(Si2O7)2O2(H2O,F,OH)2 · 3.5H2O
Colour:
Creamy white
Lustre:
Silky
Hardness:
3
Specific Gravity:
2.98
Crystal System:
Monoclinic
Name:
For Alexandra Vasilyevna Bykova (1917–2001), Russian mineralogist and chemist whose work predicted the existence of a natural hydrated analogue of Bornemanite
A heterophyllosilicate, related to bornemanite.


Unique IdentifiersHide

Mindat ID:
26447
Long-form identifier:
mindat:1:1:26447:3
GUID
(UUID V4):
14ee7b21-143d-4318-9362-1d092de6db28

IMA Classification of BykovaiteHide

Classification of BykovaiteHide

Strunz-mindat (2024):
9.BE.55

9 : SILICATES (Germanates)
B : Sorosilicates
E : Si2O7 groups, with additional anions; cations in octahedral [6] and greater coordination
Dana 8th ed.:
56.2.10.7

56 : SOROSILICATES Si2O7 Groups, With Additional O, OH, F and H2O
2 : Si2O7 Groups and O, OH, F, and H2O with cations in [4] and/or >[4] coordination

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
ByvIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of BykovaiteHide

Lustre:
Silky
Transparency:
Transparent, Translucent
Colour:
Creamy white
Hardness:
3 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
on {001}, good on {100}
Fracture:
Fibrous
Density:
2.98(3) g/cm3 (Measured)    2.72 g/cm3 (Calculated)

Optical Data of BykovaiteHide

Type:
Biaxial (+)
RI values:
nα = 1.668 nβ = 1.679 nγ = 1.710
2V:
Measured: 63° (5), Calculated: 63°
Max Birefringence:
δ = 0.042
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Pleochroism:
Non-pleochroic
Comments:
Straight extinction and positive elongation with respect to fiber length.
a ≈ Y, b ≈ Z, c ≈ X

Chemistry of BykovaiteHide

Mindat Formula:
(Ba,Na,K)2(Na,Ti,Mn)4(Ti,Nb)2(Si2O7)2O2(H2O,F,OH)2 · 3.5H2O
Elements listed:
Ba, F, H, K, Mn, Na, Nb, O, Si, Ti - search for minerals with similar chemistry
Common Impurities:
Al,Ca,Fe,K,Mn,Sr

Crystallography of BykovaiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 5.552 Å, b = 7.179 Å, c = 50.94 Å
β = 91.1°
Ratio:
a:b:c = 0.773 : 1 : 7.096
Unit Cell V:
2030 ų
Z:
4
Comment:
I112/b polytype

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
25.50 Å(100)
3.17 Å(74)
8.48 Å(72)
2.763 Å(20)
12.68 Å(14)
3.44 Å(14)
2.110 Å(14)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 4b: Highly evolved igneous rocks>3.0
35 : Ultra-alkali and agpaitic igneous rocks
Stage 7: Great Oxidation Event<2.4
47a : [Near-surface hydration of prior minerals]

Type Occurrence of BykovaiteHide

Type Locality:
ⓘ Shkatulka pegmatite, Umbozero mine, Alluaiv Mountain, Lovozersky District, Murmansk Oblast, Russia
General Appearance of Type Material:
compact spherulites, up to 3–5 mm in diameter, and spherulitic aggregates of tiny (0.005–0.05 mm) fibres radiating along [010] from a common centre
Place of Conservation of Type Material:
St. Petersburg Mining Institute, Russia, catalog number 2869/2
Geological Setting of Type Material:
Product of the hydrothermal alteration of bornemanite, in a hyperagpaitic pegmatite
Associated Minerals at Type Locality:
VuonnemiteUssingiteSteenstrupine-(Ce)SphaleriteShkatulkalite
LomonosoviteBornemaniteBelovite-(Ce)
Reference:
Khomyakov, A.P., Menshikov, Yu.P., Ferraris, G., Nemet, P., Nechelyustov, G.N. (2005) Bykovaite, BaNa{(Na,Ti)4[(Ti,Nb)2(OH,O)3Si4O14](OH,F)2}• 3H2O – the new mineral heterophyllosilicate from Lovozero alkaline massif (Kola Peninsula, Russia). Proceedings of the Russian Mineralogical Society: 134(5): 40–48.

Synonyms of BykovaiteHide

Other Language Names for BykovaiteHide

Simplified Chinese:水硅钛钡钠石
Traditional Chinese:水矽鈦鋇鈉石

Common AssociatesHide

Associated Minerals Based on Photo Data:
12 photos of Bykovaite associated with UssingiteNa2AlSi3O8OH
7 photos of Bykovaite associated with VuonnemiteNa11Ti4+Nb2(Si2O7)2(PO4)2O3(F,OH)
5 photos of Bykovaite associated with SeranditeNaMn2+2Si3O8(OH)
4 photos of Bykovaite associated with SphaleriteZnS
4 photos of Bykovaite associated with ChkaloviteNa2BeSi2O6
3 photos of Bykovaite associated with Belovite-(Ce)NaCeSr3(PO4)3F
3 photos of Bykovaite associated with UmbozeriteNa3Sr4Th[Si(O,OH)3-4]8
2 photos of Bykovaite associated with Steenstrupine-(Ce)Na14Mn2+2Fe3+2Ce6Zr(Si6O18)2(PO4)6(PO3OH)(OH)2 · 2H2O
1 photo of Bykovaite associated with AegirineNaFe3+Si2O6

Related Minerals - Strunz-mindat GroupingHide

9.BE.ParalomonosoviteNa6◻4Ti4(Si2O7)2[PO3OH][PO2(OH)2]O2(OF)Tric. 1 : P1
9.BE.CámaraiteBa3Na(Fe2+,Mn)8Ti4(Si2O7)4O4(OH,F)7Tric. 1
9.BE.Christofschäferite-(Ce)Ce3CaMnTiFe(3+)Ti2(Si2O7)2O8 Mon. 2/m : P21/m
9.BE.BobshannoniteNa2KBa(Mn,Na)8(Nb,Ti)4(Si2O7)4O4(OH)4(O,F)2Tric.
9.BE.Calciomurmanite(Na,◻)2Ca(Ti,Mg,Nb)4[Si2O7]2O2(OH,O)2(H2O)4Tric. 1 : P1
9.BE.Batievaite-(Y)Y2Ca2Ti(Si2O7)2(OH)2(H2O)4Tric. 1 : P1
9.BE.Delhuyarite-(Ce)Ce4Mg(Fe3+,W)3◻(Si2O7)2O6(OH)2Mon. 2/m : B2/m
9.BE.XAsimowiteFe2+4O(Si2O7)Orth. mmm (2/m 2/m 2/m) : Imma
9.BE.MoxuanxueiteNaCa6Zr(Si2O7)2OF3Tric. 1 : P1
9.BE.Alexkuznetsovite-(Ce)Ce2Mn(CO3)(Si2O7)Mon. 2/m : P21/b
9.BE.Biraite-(La)La2Fe2+(CO3)(Si2O7)Mon. 2/m : P21/b
9.BE.ZinkgruvaniteBa4Mn2+4Fe3+2(Si2O7)2(SO4)2O2(OH)2Tric. 1 : P1
9.BE.MadeiraiteNa2Ca2Fe2Zr2(Si2O7)2O2F2Mon. 2/m : P21/b
9.BE.BortolaniteCa2(Ca1.5Zr0.5)Na(NaCa)Ti(Si2O7)2(OF)F2Tric. 1 : P1
9.BE.Nacareniobsite-(Y)Na3Ca3YNb(Si2O7)2OF3Mon. 2/m : P21/b
9.BE.PilanesbergiteNa2Ca2Fe2Ti2(Si2O7)2O2F2Mon. 2/m : P21/b
9.BE.AlfredcaspariteSr2TiO(Si2O7)Tet. 4mm : P4bm
9.BE.02WadsleyiteMg4O(Si2O7)Orth. mmm (2/m 2/m 2/m) : Imma
9.BE.05HennomartiniteSrMn3+2(Si2O7)(OH)2 · H2OOrth. mmm (2/m 2/m 2/m) : Cmcm
9.BE.05LawsoniteCaAl2(Si2O7)(OH)2 · H2OOrth. mmm (2/m 2/m 2/m) : Cmcm
9.BE.05NoelbensoniteBaMn3+2(Si2O7)(OH)2 · H2OOrth. mm2
9.BE.05ItoigawaiteSrAl2(Si2O7)(OH)2 · H2OOrth. mmm (2/m 2/m 2/m) : Cmcm
9.BE.05CortesognoiteCaV2(Si2O7)(OH)2 · H2OOrth. mmm (2/m 2/m 2/m) : Cmcm
9.BE.07IlvaiteCaFe3+Fe2+2(Si2O7)O(OH)Orth. mmm (2/m 2/m 2/m)
9.BE.07ManganilvaiteCaFe2+Fe3+Mn2+(Si2O7)O(OH)Mon. 2/m : P21/b
9.BE.07Amamoorite CaMn2+2Mn3+(Si2O7)O(OH)Mon. 2/m : P21/b
9.BE.10SuoluniteCa2(H2Si2O7) · H2OOrth. mm2 : Fdd2
9.BE.12JaffeiteCa6(Si2O7)(OH)6Trig. 3 : P3
9.BE.15FresnoiteBa2Ti(Si2O7)OTet. 4mm : P4bm
9.BE.17BaghdaditeCa6Zr2(Si2O7)2O4Mon. 2/m : P21/b
9.BE.17BurpaliteNa2CaZr(Si2O7)F2Mon. 2/m : P21/b
9.BE.17CuspidineCa8(Si2O7)2F4Mon. 2/m : P21/b
9.BE.17HiortdahliteNa2Ca4(Ca0.5Zr0.5)Zr(Si2O7)2OF3Tric. 1 : P1
9.BE.17Janhaugite(Na,Ca)3(Mn2+,Fe2+)3(Ti,Zr,Nb)2(Si2O7)2O2(OH,F)2Mon. 2/m : P21/m
9.BE.17LåveniteNa2Ca2Mn2Zr2(Si2O7)2O2F2Mon. 2/m : P21/b
9.BE.17Niocalite(Ca,Nb)4(Si2O7)(O,OH,F)2Mon. m
9.BE.17NormanditeNaCa(Mn,Fe)(Ti,Nb,Zr)(Si2O7)OFMon. 2/m : P21/b
9.BE.17WöhleriteNa2Ca4ZrNb(Si2O7)2O3FMon. 2 : P21
9.BE.20Mosandrite-(Ce)(Ca3REE)[(H2O)2Ca0.5◻0.5]Ti(Si2O7)2(OH)2(H2O)2Mon. 2/m : P21/b
9.BE.20Nacareniobsite-(Ce)Na3Ca3(Ce,REE)Nb(Si2O7)2OF3Mon. 2/m : P21/b
9.BE.20Roumaite(Ca,Na,REE,◻)7(Nb,Ti)[Si2O7]2OF3Mon. m : Bb
9.BE.20Rinkite-(Y)Na2Ca4YTi(Si2O7)2OF3Mon. 2/m : P21/b
9.BE.22GötzeniteNaCa6Ti(Si2O7)2OF3Tric. 1 : P1
9.BE.22Hainite-(Y)Na2Ca4(Y,REE)Ti(Si2O7)2OF3Tric. 1 : P1
9.BE.22RosenbuschiteNa6Ca6Zr3Ti(Si2O7)4O2F6Tric. 1 : P1
9.BE.22KochiteNa3Ca2MnZrTi(Si2O7)2OF3Tric. 1 : P1
9.BE.22Fogoite-(Y)Na3Ca2Y2Ti(Si2O7)2OF3Tric. 1 : P1
9.BE.23DovyreniteCa6Zr(Si2O7)2(OH)4Orth. mmm (2/m 2/m 2/m) : Pnnm
9.BE.25Barytolamprophyllite(Ba,Na)2(Na,Ti,Fe3+)4Ti2(Si2O7)2O(OH,F)Mon.
9.BE.25EricssoniteBaMn2+2Fe3+(Si2O7)O(OH)Mon. 2/m : B2/m
9.BE.25Lamprophyllite(Na,Mn2+)3(Sr,Na)2(Ti,Fe3+)3(Si2O7)2O2(OH,O,F)2Mon. 2/m
9.BE.25Ericssonite-2OBaMn2+2Fe3+(Si2O7)O(OH)Orth.
9.BE.25SeidozeriteNa4MnZr2Ti(Si2O7)2O2F2Mon. 2/m : P2/b
9.BE.25Nabalamprophyllite(BaNa)Ti2Na3Ti(Si2O7)2O2(OH)2Mon. 2/m : P2/m
9.BE.25GrenmariteNa4MnZr3(Si2O7)2O2F2Mon. 2/m : P2/b
9.BE.25SchülleriteBa2Na(Mn,Ca)(Fe3+,Mg,Fe2+)2Ti2(Si2O7)2(O,F)4Tric. 1 : P1
9.BE.25KazanskyiteBaNa3Ti2Nb(Si2O7)2O2(OH)2(H2O)4Tric. 1 : P1
9.BE.25LileyiteBa2(Na,Fe,Ca)3MgTi2(Si2O7)2O2F2Mon. 2/m : B2/m
9.BE.25EmmerichiteBa2Na(Na,Fe2+)2(Fe3+,Mg)Ti2(Si2O7)2O2F2Mon. 2/m : B2/m
9.BE.25SaamiteBa◻Na3Ti2Nb(Si2O7)2O2(OH)F(H2O)2Tric. 1 : P1
9.BE.25FluorlamprophylliteNa3(SrNa)Ti3(Si2O7)2O2F2Mon. 2/m : B2/m
9.BE.25Fluorbarytolamprophyllite(Ba,Sr)2[(Na,Fe2+)3(Ti,Mg)F2][Ti2(Si2O7)2O2]Mon. 2/m : B2/m
9.BE.27MurmaniteNa2Ti2(Si2O7)O2 · 2H2OTric. 1 : P1
9.BE.27VigrishiniteNaZnTi4(Si2O7)2O3(OH)(H2O)4Tric. 1 : P1
9.BE.27KolskyiteCaNa2Ti4(Si2O7)2O4(H2O)7Tric. 1 : P1
9.BE.27SelivanovaiteNaFe3+Ti4(Si2O7)2O4(H2O)4Tric. 1 : P1
9.BE.30Epistolite(Na◻)Nb2Na3Ti(Si2O7)2O2(OH)2(H2O)4Tric. 1 : P1
9.BE.32LomonosoviteNa5Ti2(Si2O7)(PO4)O2Tric. 1 : P1
9.BE.35VuonnemiteNa11Ti4+Nb2(Si2O7)2(PO4)2O3(F,OH)Tric.
9.BE.37SoboleviteNa13Ca2Mn2Ti3(Si2O7)2(PO4)4O3F3Mon. m : Pb
9.BE.40Innelite Ba4Ti2Na(NaMn2+)Ti(Si2O7)2[(SO4)(PO4)]O2[O(OH)]Tric. 1 : P1
9.BE.40PhosphoinneliteNa3Ba4Ti3(Si2O7)2(PO4,SO4)2O2FTric.
9.BE.42YoshimuraiteBa2Mn2Ti(Si2O7)(PO4)O(OH)Tric. 1 : P1
9.BE.45QuadruphiteNa6Na2(CaNa)2Na2Ti2Na2Ti2(Si2O7)2(PO4)4O4F2Tric. 1 : P1
9.BE.47PolyphiteNa5(Na4Ca2)Ti2(Si2O7)(PO4)3O2F2Tric. 1 : P1
9.BE.50BornemaniteNa6BaTi2Nb(Si2O7)2(PO4)O2(OH)F Tric. 1 : P1
9.BE.50Shkatulkalite Na2Nb2Na3Ti(Si2O7)2O2(FO)(H2O)4(H2O)3Tric. 1 : P1
9.BE.55BafertisiteBa2Fe2+4Ti2(Si2O7)2O2(OH)2F2Tric.
9.BE.55HejtmaniteBa2Mn2+4Ti2(Si2O7)2O2(OH)2F2Tric. 1
9.BE.55Nechelyustovite(Ba,Sr,K)2(Na,Ti,Mn)4(Ti,Nb)2(Si2O7)2O2(O,H2O,F)2 · 4.5H2OMon. 2/m : B2/m
9.BE.60Delindeite(Na,K)2(Ba,Ca)2(Ti,Fe,Al)3(Si2O7)2O2(OH)2 · 2H2OMon. 2/m : B2/m
9.BE.62Orthochevkinite(Ce,La,Ca,Na,Th)4(Fe2+,Mg)2(Ti,Fe3+)3Si4O22Orth.
9.BE.62 vaStrontium Perrierite(Ce,Sr,La,Ca)4Fe2+(Ti,Zr,Fe)2Ti2(Si2O7)2O8
9.BE.62Chevkinite-(Nd)(Nd,REE)4(Fe2+,Mg)(Fe2+,Ti,Fe3+)2(Ti,Fe3+)2(Si2O7)2O8 ?
9.BE.62Perrierite-(Nd)Nd4MgFe3+2Ti2(Si2O7)2O8 ?
9.BE.65BusseniteNa2Ba2Fe2+Ti(Si2O7)(CO3)(OH)3FTric. 1 : P1
9.BE.67JinshajiangiteBaNaFe2+4Ti2(Si2O7)2O2(OH)2FTric. 1 : P1
9.BE.67PerraultiteBaNaMn2+4Ti2(Si2O7)2O2(OH)2FTric. 1
9.BE.70Karnasurtite-(Ce)(Ce,La,Th)(Ti,Nb)(Al,Fe)(Si2O7)(OH)4 · 3H2OAmor.
9.BE.70Perrierite-(Ce)Ce4MgFe3+2Ti2(Si2O7)2O8Mon. 2/m : P21/b
9.BE.70Strontiochevkinite(Sr,La,Ce,Ca)4Fe2+(Ti,Zr)2Ti2(Si2O7)2O8Mon. 2/m : P21/b
9.BE.70Chevkinite-(Ce)Ce4(Ti,Fe2+,Fe3+)5O8(Si2O7)2Mon. 2/m : P21/b
9.BE.70Polyakovite-(Ce)(Ce,Ca)4(Mg,Fe2+)(Cr3+,Fe3+)2(Ti,Nb)2(Si2O7)2O8Mon. 2/m : B2/m
9.BE.70RengeiteSr4ZrTi4(Si2O7)2O8Mon. 2/m : P21/b
9.BE.70MatsubaraiteSr4Ti5(Si2O7)2O8Mon. 2/m : P21/b
9.BE.70Dingdaohengite-(Ce)(Ce,La)4Fe2+(Ti,Fe2+,Mg,Fe2+)2Ti2(Si2O7)2O8Mon. 2/m : P21/b
9.BE.70Maoniupingite-(Ce)(Ce,Ca)4(Fe3+,Ti,Fe2+,◻)(Ti,Fe3+,Fe2+,Nb)4(Si2O7)2O8Mon. 2/m : B2/m
9.BE.70Perrierite-(La)(La,Ce,Ca)4(Fe2+,Mn)(Ti,Fe3+,Al)4[(Si2O7)O4]2Mon. 2/m : P21/b
9.BE.70UM2008-53-SiO:SrTiZrSr4ZrTi4(Si2O7)2O8Orth. mmm (2/m 2/m 2/m) : Pbca
9.BE.70Hezuolinite(Sr,REE)4Zr(Ti,Fe3+)4(Si2O7)2O8Mon. 2/m : B2/m
9.BE.72FersmaniteCa4(Na,Ca)4(Ti,Nb)4(Si2O7)2O8F3Tric.
9.BE.75BelkoviteBa3(Nb,Ti)6(Si2O7)2O12Hex. 6 m2 : P62m
9.BE.77NasonitePb6Ca4(Si2O7)3Cl2Hex. 6/m : P63/m
9.BE.80KentrolitePb2Mn3+2(Si2O7)O2Orth. mmm (2/m 2/m 2/m) : Pbcm
9.BE.80MelanotekitePb2Fe3+2(Si2O7)O2Orth. 2 2 2 : C2 2 21
9.BE.82TilleyiteCa5(Si2O7)(CO3)2Mon. 2/m : P21/b
9.BE.82Alexkuznetsovite-(La)La2Mn(CO3)(Si2O7)Mon. 2/m : P21/b
9.BE.85KillalaiteCa6.4(H0.6Si2O7)2(OH)2Mon. 2/m : P21/m
9.BE.87Stavelotite-(La)(La,Nd,Ca)3Mn2+3Cu(Mn3+,Fe3+,Mn4+)26(Si2O7)6O30Trig. 3 : P31
9.BE.90Biraite-(Ce)Ce2Fe2+(Si2O7)(CO3)Mon. 2/m : P21/b
9.BE.90Magnesiorowlandite-(Y)Y4(Mg,Fe)(Si2O7)2F2Tric. 1 : P1
9.BE.92Cervandonite-(Ce)(Ce,Nd,La)(Fe3+,Fe2+,Ti,Al)3O2(Si2O7)(As3+O3)(OH)Trig. 3m : R3m
9.BE.92Chirvinskyite(Na,Ca)13(Fe,Mn,◻)2(Ti,Zr)5(Si2O7)4(OH,O)12 · 2H2OTric. 1 : P1
9.BE.95BatisiviteBaV3+8Ti6(Si2O7)O22Tric. 1 : P1
9.BE.95RusinoviteCa10(Si2O7)3Cl2 Orth. mmm (2/m 2/m 2/m) : Cmcm
9.BE.97Schlüterite-(Y)(Y,REE)2AlSi2O7(OH)2FMon. 2/m : P21/b

Other InformationHide

Notes:
Stable in water, but decomposes slowly in solutions of 10% HCl or HNO3.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for BykovaiteHide

References for BykovaiteHide

Localities for BykovaiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Russia (TL)
 
  • Murmansk Oblast
    • Lovozersky District
      • Alluaiv Mountain
        • Umbozero mine
Khomyakov et al. (2005) +1 other reference
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