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Aeschynite-(Nd)

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Formula:
(Nd,Ln,Ca)(Ti,Nb)2(O,OH)6
Colour:
Dark to pale brown, brownish black
Lustre:
Adamantine
Hardness:
5 - 6
Specific Gravity:
4.6 - 5.04
Crystal System:
Orthorhombic
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

Physical Properties of Aeschynite-(Nd)

Adamantine
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:
5 - 6 on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Conchoidal
Density:
4.6 - 5.04 g/cm3 (Measured)    

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,Ln,Ca)(Ti,Nb)2(O,OH)6
IMA Formula:
Nd(Ti,Nb)2(O,OH)6

Crystallography of Aeschynite-(Nd)

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal

X-Ray Powder Diffraction

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

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
Associated Minerals at Type Locality:

Other Language Names for Aeschynite-(Nd)

Simplified Chinese:钕易解石

Relationship of Aeschynite-(Nd) to other Species

Other Members of this group:
Aeschynite-(Ce)(Ce,Ca,Fe,Th)(Ti,Nb)2(O,OH)6
Aeschynite-(Y)(Y,Ln,Ca,Th)(Ti,Nb)2(O,OH)6
Nioboaeschynite-(Ce)(Ce,Ca)(Nb,Ti)2(O,OH)6
Nioboaeschynite-(Nd)(Nd,Ce,Ca,Th)(Nb,Ti,Fe,Ta)2(O,OH)6
Nioboaeschynite-(Y)(Y,REE,Ca,Th,Fe)(Nb,Ti,Ta)2(O,OH)6
RynersoniteCaTa2O6
Tantalaeschynite-(Y)Y(Ta,Ti,Nb)2O6
Vigezzite(Ca,Ce)(Nb,Ta,Ti)2O6

Common Associates

AegirineNaFe3+Si2O6
AlbiteNa(AlSi3O8)
BaryteBaSO4
FluoriteCaF2
MagnetiteFe2+Fe3+2O4
PhlogopiteKMg3(AlSi3O10)(OH)2
Riebeckite◻[Na2][Fe2+3Fe3+2]Si8O22(OH)2
Associated Minerals Based on Photo Data:
Zircon1 photo of Aeschynite-(Nd) associated with Zircon on mindat.org.
Quartz1 photo of Aeschynite-(Nd) associated with Quartz on mindat.org.
Ferriallanite-(Ce)1 photo of Aeschynite-(Nd) associated with Ferriallanite-(Ce) on mindat.org.
Fluorite1 photo of Aeschynite-(Nd) associated with Fluorite on mindat.org.

Related Minerals - Nickel-Strunz Grouping

4.DF.05Aeschynite-(Ce)(Ce,Ca,Fe,Th)(Ti,Nb)2(O,OH)6
4.DF.05Aeschynite-(Y)(Y,Ln,Ca,Th)(Ti,Nb)2(O,OH)6
4.DF.05Nioboaeschynite-(Ce)(Ce,Ca)(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,REE,Ca,Th,Fe)(Nb,Ti,Ta)2(O,OH)6
4.DF.05RynersoniteCaTa2O6
4.DF.05Tantalaeschynite-(Y)Y(Ta,Ti,Nb)2O6
4.DF.05Vigezzite(Ca,Ce)(Nb,Ta,Ti)2O6
4.DF.10ChangbaiitePbNb2O6
4.DF.15Murataite-(Y)(Y,Na)6Zn(Zn,Fe3+)4(Ti,Nb,Na)12O29(O,F,OH)10F4

Related Minerals - Hey's Chemical Index of Minerals Grouping

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)A2Nb2(O,OH)6Z
18.2.10Strontiopyrochlore (of Hogarth 1977)A2Nb2(O,OH)6Z
18.2.11Loparite-(Ce)(Na,REE)Ti2O6
18.2.12Fersmite(Ca,Ce,Na)(Nb,Ta,Ti)2(O,OH,F)6
18.2.13Aeschynite-(Ce)(Ce,Ca,Fe,Th)(Ti,Nb)2(O,OH)6
18.2.15Aeschynite-(Y)(Y,Ln,Ca,Th)(Ti,Nb)2(O,OH)6
18.2.16Nioboaeschynite-(Ce)(Ce,Ca)(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(Ta,Ti,Nb)2O6
18.2.19Vigezzite(Ca,Ce)(Nb,Ta,Ti)2O6
18.2.20Murataite-(Y)(Y,Na)6Zn(Zn,Fe3+)4(Ti,Nb,Na)12O29(O,F,OH)10F4

Related Minerals - Dana Grouping (8th Ed.)

8.3.6.1Aeschynite-(Ce)(Ce,Ca,Fe,Th)(Ti,Nb)2(O,OH)6
8.3.6.2Nioboaeschynite-(Ce)(Ce,Ca)(Nb,Ti)2(O,OH)6
8.3.6.3Aeschynite-(Y)(Y,Ln,Ca,Th)(Ti,Nb)2(O,OH)6
8.3.6.4Tantalaeschynite-(Y)Y(Ta,Ti,Nb)2O6
8.3.6.7Nioboaeschynite-(Y)(Y,REE,Ca,Th,Fe)(Nb,Ti,Ta)2(O,OH)6

Other Information

Magnetism:
Non-Magnetic
Notes:
Radioactive.
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:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Zhang, P., Tao, K. (1982) Aeschynite-(Nd). Scientia Geologica Sinica: 1982(4): 424-428. [in Chinese with English abstract]
Dunn, P.J., Chao, G.Y., Grice, J.D., Ferraiolo, J.A., Fleischer, M., Pabst, A., Zilczer, J.A. (1984) New mineral names. American Mineralogist: 69: 565-569.
Anthony, J. W. et al. (1997) Handbook of Mineralogy, Vol. 3, 4.

Internet Links for Aeschynite-(Nd)

mindat.org URL:
https://www.mindat.org/min-38.html
Please feel free to link to this page.

Localities for Aeschynite-(Nd)

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.
(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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