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Aeschynite-(Ce)

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Formula:
(Ce,Ca,Fe,Th)(Ti,Nb)
 
2
(O,OH)
 
6
System:OrthorhombicColour:Black, brown, light ...
Lustre:Resinous, Waxy, Sub-MetallicHardness:5 - 6
Member of:Aeschynite Group
Name:From the Greek αισχύνη ("aeschyne") for "shame", alluding to the fact that early chemists had difficulty with separations of titanium from zirconium in some samples, and the dominant lanthanide element in the composition.


The cerium analogue of aeschynite-(Y) and the titanium analogue of nioboaeschynite-(Ce).

Classification of Aeschynite-(Ce)

IMA status:Approved
Strunz 8th edition ID:4/D.21-20
Nickel-Strunz 10th (pending) edition ID:4.DF.05

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
F : With large (+- medium-sized) cations; dimers and trimers of edgesharing octahedra
Dana 8th edition ID:8.3.6.1

8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
3 : AB2O6
Hey's CIM Ref.:18.2.13

18 : Niobates and Tantalates
2 : Niobates and tantalates containing rare earths but not U
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Type Occurrence of Aeschynite-(Ce)

Type Locality:Gadolinite Pit (Pits Nos. 75 & 76), Dolgiye Mosty reserve-guard station, Ilmen Natural Reserve, Ilmen Mts, Chelyabinsk Oblast', Southern Urals, Urals Region, Russia

Occurrences of Aeschynite-(Ce)

Geological Setting:In nepheline syenite and alkali syenite massifs, in granite pegmatites, in carbonatites in alkalic rocks, as a detrital mineral in placers.

Physical Properties of Aeschynite-(Ce)

Lustre:Resinous, Waxy, Sub-Metallic
Diaphaneity (Transparency):Translucent
Comment:dull when altered
Colour:Black, brown, light brown to yellow
Comment:reddish brown to light brown in transmitted light.
Streak:Nearly black to brown
Hardness (Mohs):5 - 6
Tenacity:Brittle
Cleavage:Imperfect/Fair
on {100}, interrupted
Parting:parallel to {010} when nonmetamict
Fracture:Conchoidal
Density (measured):5.19 g/cm3
Density (calculated):5.617 g/cm3

Crystallography of Aeschynite-(Ce)

Crystal System:Orthorhombic
Class (H-M):mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:Pmna
Cell Parameters:a = 7.538Å, b = 10.958Å, c = 5.396Å
Ratio:a:b:c = 0.688 : 1 : 0.492
Unit Cell Volume:V 445.72 ų (Calculated from Unit Cell)
Z:4
Morphology:Crystals are prismatic, parallel to [001], also tabular on {010} and striated on {010} parallel to [100]
X-Ray Powder Diffraction:
d-spacingIntensity
2.037 (25)
2.698 (30)
2.975 (100)
3.024 (80)
3.106 (35)
4.431 (25)
5.48 (25)
(
Comments:Recorded on synthetic CeTiNbO6.

Chemical Properties of Aeschynite-(Ce)

Formula:
(Ce,Ca,Fe,Th)(Ti,Nb)
 
2
(O,OH)
 
6
Simplified for copy/paste:(Ce,Ca,Fe,Th)(Ti,Nb)2(O,OH)6
Essential elements:Ce, O, Ti
All elements listed in formula:Ca, Ce, Fe, H, Nb, O, Th, Ti
Analytical Data:Results of the analysis of a sample from Hidra island, Norway
Nb2O5 (23.85)
Ta2O5 (6.97)
TiO2 (22.60)
ThO2 (15.42)
(Y,Er)2O3 (4.53)
Ce2O3 (19.50)
FeO (4.28)
CaO (2.52)

sum 99.67 wt.-%
Common Impurities:REE,Sn

Relationship of Aeschynite-(Ce) to other Species

Series:Forms a series with Nioboaeschynite-(Ce) (see here)
Forms a series with Aeschynite-(Y) (see here)
Member of:Aeschynite Group
Other Members of Group:

- +
Aeschynite-(Nd)
(Nd,Ce,Ca)(Ti,Nb)
 
2
(O,OH)
 
6
Aeschynite-(Y)
(Y,Ca,Fe,Th)(Ti,Nb)
 
2
(O,OH)
 
6
Nioboaeschynite-(Ce)
(Ce,Ca,Th)(Nb,Ti)
 
2
(O,OH)
 
6
Nioboaeschynite-(Nd)
(Nd,Ce,Ca,Th)(Nb,Ti,Fe,Ta)
 
2
(O,OH)
 
6
Nioboaeschynite-(Y)
(Y,Ca,Ce,Nd,Th)(Nb,Ti,Ta)
 
2
(O,OH)
 
6
Rynersonite
Ca(Ta,Nb)
 
2
O
 
6
Tantalaeschynite-(Y)
(Y,Ce,Ca)(Ta,Ti,Nb)
 
2
O
 
6
Vigezzite
(Ca,Ce)(Nb,Ti)
 
2
O
 
6
Common Associates:
ZirconTitaniteSamarskite-(Y)Feldspar GroupColumbite
Allanite
Related Minerals - Nickel-Strunz Grouping):

- +
4.DF.05Aeschynite-(Nd)
(Nd,Ce,Ca)(Ti,Nb)
 
2
(O,OH)
 
6
4.DF.05Aeschynite-(Y)
(Y,Ca,Fe,Th)(Ti,Nb)
 
2
(O,OH)
 
6
4.DF.05Nioboaeschynite-(Ce)
(Ce,Ca,Th)(Nb,Ti)
 
2
(O,OH)
 
6
4.DF.05Nioboaeschynite-(Nd)
(Nd,Ce,Ca,Th)(Nb,Ti,Fe,Ta)
 
2
(O,OH)
 
6
4.DF.05Nioboaeschynite-(Y)
(Y,Ca,Ce,Nd,Th)(Nb,Ti,Ta)
 
2
(O,OH)
 
6
4.DF.05Rynersonite
Ca(Ta,Nb)
 
2
O
 
6
4.DF.05Tantalaeschynite-(Y)
(Y,Ce,Ca)(Ta,Ti,Nb)
 
2
O
 
6
4.DF.05Vigezzite
(Ca,Ce)(Nb,Ti)
 
2
O
 
6
4.DF.10Changbaiite
PbNb
 
2
O
 
6
4.DF.15Murataite-(Y)
(Y,Na)
 
6
Zn(Zn,Fe
3+
 
)
 
4
(Ti,Nb,Na)
 
12
O
 
29
(O,F,OH)
 
10
F
 
4
Related Minerals - Hey's Index Grouping:

- +
18.2.1Fergusonite-(Y)
YNbO
 
4
18.2.2β-Fergusonite-(Y)
YNbO
 
4
18.2.3Fergusonite-(Ce)
(Ce,La,Nd)NbO
 
4
18.2.4β-Fergusonite-(Ce)
(Ce,La,Nd)NbO
 
4
18.2.5Fergusonite-(Nd)
(Nd,Ce)(Nb,Ti)O
 
4
18.2.6β-Fergusonite-(Nd)
(Nd,Ce)NbO
 
4
18.2.7Formanite-(Y)
YTaO
 
4
18.2.8Pyrochlore Group
A
 
2
Nb
 
2
(O,OH)
 
6
Z
18.2.9Ceriopyrochlore (of Hogarth 1977)
18.2.10Strontiopyrochlore (of Hogarth 1977)
18.2.11Loparite-(Ce)
(Na,Ce,Ca,Sr,Th)(Ti,Nb,Fe)O
 
3
18.2.12Fersmite
(Ca,Y)(Nb,Ta,Ti)
 
2
(O,OH)
 
6
18.2.14Aeschynite-(Nd)
(Nd,Ce,Ca)(Ti,Nb)
 
2
(O,OH)
 
6
18.2.15Aeschynite-(Y)
(Y,Ca,Fe,Th)(Ti,Nb)
 
2
(O,OH)
 
6
18.2.16Nioboaeschynite-(Ce)
(Ce,Ca,Th)(Nb,Ti)
 
2
(O,OH)
 
6
18.2.17Nioboaeschynite-(Nd)
(Nd,Ce,Ca,Th)(Nb,Ti,Fe,Ta)
 
2
(O,OH)
 
6
18.2.18Tantalaeschynite-(Y)
(Y,Ce,Ca)(Ta,Ti,Nb)
 
2
O
 
6
18.2.19Vigezzite
(Ca,Ce)(Nb,Ti)
 
2
O
 
6
18.2.20Murataite-(Y)
(Y,Na)
 
6
Zn(Zn,Fe
3+
 
)
 
4
(Ti,Nb,Na)
 
12
O
 
29
(O,F,OH)
 
10
F
 
4

Other Names for Aeschynite-(Ce)

Other Languages:
German:Aeschynit-(Ce)
Italian:Aeschynite-(Ce)
Russian:Эшинит-(Ce)
Simplified Chinese:铈易解石
Varieties:
AlumolyndochiteCalciolyndochite

Other Information

Other Information:radioactive, magnetic
Health Warning:Contains thorium - always wash hands after handling. Avoid inhaling dust when handling or breaking. Never lick or ingest. Avoid prolonged exposure in proximity of the body. Store away from inhabited areas.

References for Aeschynite-(Ce)

Reference List:

- +
Palache, C., Berman, H. and Frondel, C. (1944) Dana's system of mineralogy, 7th ed., Vol. 1, 793-797.

Vlasov, K.A., Ed. (1966) Mineralogy of rare elements, Vol. 2, 489-496 .

Alexandrov, V. B. (1962) The crystal structure of aeschynite, Doklady Acad. Nauk SSSR 142, 181-184.

Fleischer, M. (1966) Rare earths in the aeschynite-priorite series. The status of lyndochite. Mineralogical Magazine 35, 801-809.

Ewing, R.C. (1976) A numerical approach toward the classification of complex, orthorhombic, rare-earth, AB2O6-type Nb-Ta-Ti oxides. Canadian Mineralogist 14, 111-119.

Anthony, J. W. et al. (1997) Handbook of Mineralogy, Vol. 3, 3.

Internet Links for Aeschynite-(Ce)

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Aeschynite-(Ce) details from Handbook of Mineralogy (PDF)
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  • Localities for Aeschynite-(Ce)

    The 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.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Austria
     
    • Salzburg
      • Hohe Tauern
        • Habach valley
          • Nasenkopf
    J. W. Anthony et al.: Handbook of Mineralogy, Vol. III (1997)
        • Rauris valley
          • Hüttwinkl valley
    R. O. Meyer collection
    J. W. Anthony et al.: Handbook of Mineralogy, Vol. III (1997)
    Canada
     
    • Newfoundland and Labrador
      • Labrador
    GSC locality database
    • Ontario
      • Renfrew Co.
        • Lyndoch Township
    ontariominerals.com
    China
     
    • Hunan Province
      • Yongzhou Prefecture
        • Jianghua Co.
          • Guposhan Sn-polymetallic ore field
    Zhang Peishan, Yang Zhuming, Tao Kejie, and Yang Xueming (1996): "Mineralogy and Geology of Rare Earths in China", Science Press (Beijing), 226 pp.
    • Inner Mongolia Autonomous Region
      • Baotou League (Baotou Prefecture)
        • Bayan Obo Mining District
          • Bayan Obo
    Zhuming Yang, Rengui Song, Kejie Tao, and Peishan Zhang (2003): Journal of the Chinese Rare Earth Society 21(6), 716-720
    Czech Republic
     
    • Moravia (Mähren; Maehren)
      • Vysočina Region
        • Třebíč
    Pauliš P., Kopecký S., Černý P. 2007: Uranové minerály České Republiky a jejich naleziště. 1. část. (Kutna Hora, issue 1)]
    Pauliš P., Kopecký S., Černý P. 2007: Uranové minerály České Republiky a jejich naleziště. 1. část. (Kutna Hora, issue 1)]
    Pauliš P., Kopecký S., Černý P. 2007: Uranové minerály České Republiky a jejich naleziště. 1. část. (Kutna Hora, issue 1)]
    France
     
    • Aquitaine
      • Pyrénées-Atlantiques
        • Aramits
          • Ance
    MONCHOUX P., FONTAN F., DE PARSEVAL P., MARTIN R. F., WANG R. C. (2006) - Igneous albitite dikes in orogenic lherzolithes, Western Pyrénées, France: A possible source for corundum and alkali feldspar xenocrysts in basaltic terranes. I. Mineralogical Asssociations. The Canadian Mineralogist, Vol. 44, pp. 817-842.
    MONCHOUX P., FONTAN F., DE PARSEVAL P., MARTIN R. F., WANG R. C. (2006) - Igneous albitite dikes in orogenic lherzolithes, Western Pyrénées, France: A possible source for corundum and alkali feldspar xenocrysts in basaltic terranes. I. Mineralogical Asssociations. The Canadian Mineralogist, Vol. 44, pp. 817-842.
    Germany
     
    • Rhineland-Palatinate
      • Eifel
        • Laach lake volcanic complex
          • Kruft
    Blass, G., Emmerich, F., Graf, HW., Schäfer, Ch., Tschörtner, J., (2006): Minerale der Eifelvulkane, Version 1.0, CD, published by authors
          • Mendig
            • Niedermendig
    Blass, G., Emmerich, F., Graf, HW., Schäfer, Ch., Tschörtner, J., (2006): Minerale der Eifelvulkane, Version 1.0, CD, published by authors
    Blass, G., Emmerich, F., Graf, HW., Tschörtner, J., Minerale der Eifelvulkane, CD, published by authors, 2006
              • Wingertsberg
    Blass, G., Emmerich, F., Graf, HW., Tschörtner, J., Minerale der Eifelvulkane, CD, published by authors, 2006
    • Saxony
      • Oberlausitz
        • Görlitz
    J. W. Anthony et al.: Handbook of Mineralogy, Vol. III (1997)
        • Weißenberg
    J. W. Anthony et al.: Handbook of Mineralogy, Vol. III (1997)
    • Thuringia
      • Wurzbach
        • Weitisberga
    Wittern: "Mineralfundorte in Deutschland", 2001
    Italy
     
    • Trentino-Alto Adige
      • Trento Province
        • Giudicarie Valley
          • Breguzzo
            • San Pietro-Breguzzo Valley
              • Malga Trivena hut
    Giere, R. & Williams, C.T. (1992)
    Kazakhstan
     
    • Karagandy Province (Qaragandy Oblysy; Karaganda Oblast')
    no reference
    Mongolia
     
    • Hovd Aimag (Khovd Aimag)
      • Altai Mts
    P.M. Kartashov data
    Namibia
     
    • Erongo Region
      • Swakopmund District
        • Arandis
    Irene M. Abraham (2009): Geology and spatial distribution of uranium mineralisation in the SK anomaly area, Rossing area, Namibia, Master thesis University of the Witwatersrand.
    Norway
     
    • Aust-Agder
      • Iveland
    J. W. Anthony et al.: Handbook of Mineralogy, Vol. III (1997)
    • Finnmark
      • Hasvik
        • Sørøya
    Nordrum, F.S. (2001): Noen funn av mineraler i Norge 2000-2001, part II. STEIN 28 (3): 16- 24
    • Vest-Agder
      • Flekkefjord
    J. W. Anthony et al.: Handbook of Mineralogy, Vol. III (1997)
    Russia
     
    • Far-Eastern Region
      • Khabarovskiy Kray
        • Aldan province
    Pavel M. Kartashov data
    • Northern Region
      • Murmanskaja Oblast'
        • Kola Peninsula
    www.koeln.netsurf.de/~w.steffens/khib.htm
            • Kukisvumchorr Mt
    Shlyukova Z.V. (1986) Mineralogy of contact formations of Khibina massif, - Moscow, Nauka, p. 96 (in Rus.)
    www.koeln.netsurf.de/~w.steffens/lovo.htm
    • Urals Region
      • Southern Urals
        • Chelyabinsk Oblast'
          • Ilmen Mts
            • Ilmen Natural Reserve
    P.M. Kartashov data
              • Dolgiye Mosty reserve-guard station
    Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
    The Canadian Mineralogist Vol. 39, pp. 1095-1104 (2001)
    Slovakia
     
    • Košice Region
      • Rožňava Co.
    Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590k
    South Korea
     
    • Chungcheongbukdo (Chungchong-pukto)
      • Chungju (Chung Won Kum; Chung-ju)
        • Joongwon-gun
          • Mt. Eorae
    P.M. Kartashov data
    Sweden
     
    • Medelpad
      • Sundsvall
    Sandström, F., Binett, T., Wiklund, C. & Vikström, J. (2010): Alnöområdets geologi och mineralogi. Litiofilen. 27 (2):14-42
    Switzerland
     
    • Grischun (Grisons; Graubünden)
      • Vorderrhein Valley
        • Tujetsch (Tavetsch)
    J. W. Anthony et al.: Handbook of Mineralogy, Vol. III (1997)
    • Ticino (Tessin)
      • Leventina
    J. W. Anthony et al.: Handbook of Mineralogy, Vol. III (1997)
    USA
     
    • Colorado
      • Clear Creek Co.
        • Dailey District (Jones Pass District)
    Minerals of Colorado (1997) Eckels, E. B.; USGS Open-File Report 80-661
    • Idaho
      • Elmore Co.
    Ream, Lanny L. 2004. Idaho Minerals, 2nd edition, Revised and Updated
    • Montana
      • Ravalli Co.
        • Darby
    J. W. Anthony et al.: Handbook of Mineralogy, Vol. III (1997)
    • North Carolina
      • Yancey Co.
        • Spruce Pine District
          • Burnsville
            • Hurricane Mountain
    W.E,Hidden.,1882, Notes on some North Carolina Minerals,Jahrb.f.Min,1883,Vo.2,Ref,148-149,America Journal Of Science,1882,Vol.24,pg.372-374
    Warner,Julie K.,and Ewing,Rodney C.,(1993) Crystal Chemistry Of Samarskite,American Mineralogist,Vol.78,pg.419-424,Table #2.Specimen #131,G.Lumkin,University of New Mexico
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