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Aeschynite-(Nd)

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Formula:
(Nd,Ce,Ca)(Ti,Nb)2(O,OH)6
System:
Orthorhombic
Colour:
Dark to pale brown, ...
Lustre:
Adamantine
Hardness:
5 - 6
Name:
For its relationship to Aeschynite-(Ce), with Neodymium as the dominant rare-earth element.
As tabular and prismatic crystals, to several mm, and as equigranular and radiating clusters, massive.

Classification of Aeschynite-(Nd)

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
8.3.6.5

8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
3 : AB2O6
18.2.14

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

General Appearance of Type Material:
as tabular and prismatic crystals to several mm, as equigranular and radiating clusters, also massive
Geological Setting of Type Material:
veins in slate and metamorphosed dolostone

Occurrences of Aeschynite-(Nd)

Geological Setting:
In veins in slate and metamorphosed dolostone.

Physical Properties of Aeschynite-(Nd)

Adamantine
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
Dark to pale brown, brownish black
Comment:
yellowish orange to reddish orange in thin section; dark grey in reflected light.
Streak:
Light yellowish brown
Hardness (Mohs):
5 - 6
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Conchoidal
Density:
4.6 - 5.04 g/cm3 (Measured)    

Crystallography of Aeschynite-(Nd)

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
X-Ray Powder Diffraction Data:
d-spacingIntensity
1.53 (6)
1.575 (7)
1.95 (6)
2.64 (5)
2.93 (10)
3.00 (9)
5.45 (5)
Comments:
Material from Bayan Obo, China, after heating at 800 °C; before heating, only one line at 2.03 A was observed

Optical Data of Aeschynite-(Nd)

Type:
Isotropic
RI values:
n = 2.1 - 2.4
2V:
Measured: 78° to 82°
Max Birefringence:
δ = 0.000 - Isotropic minerals have no birefringence
Surface Relief:
Very High
Dispersion:
weak to strong
Colour in reflected light:
dark grey
Pleochroism:
Visible

Chemical Properties of Aeschynite-(Nd)

Formula:
(Nd,Ce,Ca)(Ti,Nb)2(O,OH)6
Essential elements:
All elements listed in formula:
Analytical Data:
Material from Bayan Obo, China; H2O calculated by difference to 100.00 wt.-%
Nb2O5 (30.16)
Ta2O5 (0.04)
SiO2 (0.65)
TiO2 (22.46)
ThO2 (1.33)
Al2O3 (0.54)
La2O3 (2.30)
CeO2 (13.16)
Pr6O11 (2.67)
Nd2O3 (13.71)
Sm2O3 (2.32)
(Eu,Gd)2O3 (1.87)
Y2O3 (1.26)
Dy2O3 (0.70)
Fe2O3 (1.99)
MnO (0.06)
MgO (0.44)
CaO (2.96)
Na2O (0.42)
H2O (0.96)

sum 100.00 wt.-%
Empirical Formula:
{Nd0.30Ce0.29Ca0.19Pr0.06La0.05Sm0.05Na0.05(Eu,Gd)0.04Mg0.04Y0.03Dy0.02Th0.02}Σ=1.14(Ti1.00Nb0.82Fe3+0.09Al0.04Si0.04)Σ=1.99{O5.62(OH)0.38}Σ=6.00

Relationship of Aeschynite-(Nd) to other Species

Other Members of Group:
Aeschynite-(Ce)(Ce,Ca,Fe,Th)(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-(Ce)(Ce,Ca,Fe,Th)(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
18.2.13Aeschynite-(Ce)(Ce,Ca,Fe,Th)(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-(Nd)

Name in Other Languages:
Simplified Chinese:钕易解石

Other Information

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-(Nd)

Reference List:
Zhang Peishan and Tao Kejie (1982) Aeschynite-(Nd). Scientia Geologica Sinica 1982(4), 424-428 (in Chinese with English abstract). - American Mineralogist (1984), 69, 565 (abstract).

Anthony, J. W. et al. (1997) Handbook of Mineralogy, Vol. 3, 4.

Internet Links for Aeschynite-(Nd)

Localities for Aeschynite-(Nd)

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.
Canada
 
  • Ontario
    • Renfrew Co.
      • Lyndoch Township
ontariominerals.com
China (TL)
 
  • Inner Mongolia Autonomous Region
    • Baotou League (Baotou Prefecture)
      • Bayan Obo Mining District
        • Bayan Obo
          • Bayan Obo deposit (Bayun-Obo deposit; Baiyunebo deposit)
Peishan Zhang and Kejie Tao (1982): Scientia Geologica Sinica 4, 424-428; 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)]
Romania
 
  • Harghita Co.
    • Ditrău (Ditró)
Szakáll, S. & Kristály, F., Eds. (2010): Mineralogy of Székelyland, Eastern Transylvania, Romania. Csík County Nature and Conservation Society, Miercurea-Ciuc, Romania, 321 pp.
Russia
 
  • Eastern-Siberian Region
    • Krasnoyarsk Territory (Krasnoyarsk Kray; Krasnoyarskii Krai)
      • Enisei Range (Yenisei Ridge; Enisei Ridge)
        • Tatarka Range
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
South Korea
 
  • Chungcheongbukdo (Chungchong-pukto)
    • Chungju (Chung Won Kum; Chung-ju)
      • Joongwon-gun
        • Mt. Eorae
P.M. Kartashov analytical data (2002)
Mineral and/or Locality  
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