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Aeschynite-(Ce)

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Formula:
(Ce,Ca,Fe,Th)(Ti,Nb)2(O,OH)6
System:
Orthorhombic
Colour:
Black, brown, light ...
Lustre:
Resinous, Waxy, Sub-Metallic
Hardness:
5 - 6
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)

Approved
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
8.3.6.1

8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
3 : AB2O6
18.2.13

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

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)

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:
5.19 g/cm3 (Measured)    5.617 g/cm3 (Calculated)

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 Data:
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
Essential elements:
All elements listed in formula:
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)
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
RynersoniteCa(Ta,Nb)2O6
Tantalaeschynite-(Y)(Y,Ce,Ca)(Ta,Ti,Nb)2O6
Vigezzite(Ca,Ce)(Nb,Ti)2O6
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.05RynersoniteCa(Ta,Nb)2O6
4.DF.05Tantalaeschynite-(Y)(Y,Ce,Ca)(Ta,Ti,Nb)2O6
4.DF.05Vigezzite(Ca,Ce)(Nb,Ti)2O6
4.DF.10ChangbaiitePbNb2O6
4.DF.15Murataite-(Y)(Y,Na)6Zn(Zn,Fe3+)4(Ti,Nb,Na)12O29(O,F,OH)10F4
18.2.1Fergusonite-(Y)YNbO4
18.2.2Fergusonite-(Y)-βYNbO4
18.2.3Fergusonite-(Ce)(Ce,La,Nd)NbO4
18.2.4Fergusonite-(Ce)-β(Ce,La,Nd)NbO4
18.2.5Fergusonite-(Nd)(Nd,Ce)(Nb,Ti)O4
18.2.6Fergusonite-(Nd)-β(Nd,Ce)NbO4
18.2.7Formanite-(Y)YTaO4
18.2.8Pyrochlore GroupA2Nb2(O,OH)6Z
18.2.9Ceriopyrochlore (of Hogarth 1977)
18.2.10Strontiopyrochlore (of Hogarth 1977)
18.2.11Loparite-(Ce)(Na,Ce,Ca,Sr,Th)(Ti,Nb,Fe)O3
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)2O6
18.2.19Vigezzite(Ca,Ce)(Nb,Ti)2O6
18.2.20Murataite-(Y)(Y,Na)6Zn(Zn,Fe3+)4(Ti,Nb,Na)12O29(O,F,OH)10F4

Other Names for Aeschynite-(Ce)

Name in Other Languages:
Simplified Chinese:铈易解石

Other Information

Other Information:
radioactive, magnetic
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

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)

Localities for Aeschynite-(Ce)

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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 (Trentino-Südtirol)
    • Trento Province
      • Giudicarie Valleys
        • 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
Mineral and/or Locality  
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