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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.


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Classification of Aeschynite-(Nd)Hide

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)Hide

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)Hide

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)Hide

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

Crystallography of Aeschynite-(Nd)Hide

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

X-Ray Powder DiffractionHide

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)Hide

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)Hide

Simplified Chinese:钕易解石

Relationship of Aeschynite-(Nd) to other SpeciesHide

Other Members of this group:
Aeschynite-(Ce)(Ce,Ca,Fe,Th)(Ti,Nb)2(O,OH)6Orth. mmm (2/m 2/m 2/m) : Pmna
Aeschynite-(Y)(Y,Ln,Ca,Th)(Ti,Nb)2(O,OH)6Orth. mmm (2/m 2/m 2/m) : Pmna
Nioboaeschynite-(Ce)(Ce,Ca)(Nb,Ti)2(O,OH)6Orth.
Nioboaeschynite-(Nd)(Nd,Ce,Ca,Th)(Nb,Ti,Fe,Ta)2(O,OH)6Orth.
Nioboaeschynite-(Y)(Y,REE,Ca,Th,Fe)(Nb,Ti,Ta)2(O,OH)6Orth. mmm (2/m 2/m 2/m) : Pban
RynersoniteCaTa2O6Orth. mmm (2/m 2/m 2/m)
Tantalaeschynite-(Y)Y(Ta,Ti,Nb)2O6Orth. mmm (2/m 2/m 2/m)
Vigezzite(Ca,Ce)(Nb,Ta,Ti)2O6Orth.

Common AssociatesHide

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 GroupingHide

4.DF.05Aeschynite-(Ce)(Ce,Ca,Fe,Th)(Ti,Nb)2(O,OH)6Orth. mmm (2/m 2/m 2/m) : Pmna
4.DF.05Aeschynite-(Y)(Y,Ln,Ca,Th)(Ti,Nb)2(O,OH)6Orth. mmm (2/m 2/m 2/m) : Pmna
4.DF.05Nioboaeschynite-(Ce)(Ce,Ca)(Nb,Ti)2(O,OH)6Orth.
4.DF.05Nioboaeschynite-(Nd)(Nd,Ce,Ca,Th)(Nb,Ti,Fe,Ta)2(O,OH)6Orth.
4.DF.05Nioboaeschynite-(Y)(Y,REE,Ca,Th,Fe)(Nb,Ti,Ta)2(O,OH)6Orth. mmm (2/m 2/m 2/m) : Pban
4.DF.05RynersoniteCaTa2O6Orth. mmm (2/m 2/m 2/m)
4.DF.05Tantalaeschynite-(Y)Y(Ta,Ti,Nb)2O6Orth. mmm (2/m 2/m 2/m)
4.DF.05Vigezzite(Ca,Ce)(Nb,Ta,Ti)2O6Orth.
4.DF.10ChangbaiitePbNb2O6Trig.
4.DF.15Murataite-(Y)(Y,Na)6Zn(Zn,Fe3+)4(Ti,Nb,Na)12O29(O,F,OH)10F4 Iso. m3m (4/m 3 2/m) : Fm3m

Related Minerals - Dana Grouping (8th Ed.)Hide

8.3.6.1Aeschynite-(Ce)(Ce,Ca,Fe,Th)(Ti,Nb)2(O,OH)6Orth. mmm (2/m 2/m 2/m) : Pmna
8.3.6.2Nioboaeschynite-(Ce)(Ce,Ca)(Nb,Ti)2(O,OH)6Orth.
8.3.6.3Aeschynite-(Y)(Y,Ln,Ca,Th)(Ti,Nb)2(O,OH)6Orth. mmm (2/m 2/m 2/m) : Pmna
8.3.6.4Tantalaeschynite-(Y)Y(Ta,Ti,Nb)2O6Orth. mmm (2/m 2/m 2/m)
8.3.6.7Nioboaeschynite-(Y)(Y,REE,Ca,Th,Fe)(Nb,Ti,Ta)2(O,OH)6Orth. mmm (2/m 2/m 2/m) : Pban

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

18.2.1Fergusonite-(Y)YNbO4Tet. 4/m : I41/a
18.2.2Fergusonite-(Y)-βYNbO4Mon. 2/m
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)YTaO4Tet. 4/m : I41/a
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)6Orth. mmm (2/m 2/m 2/m) : Pbcn
18.2.13Aeschynite-(Ce)(Ce,Ca,Fe,Th)(Ti,Nb)2(O,OH)6Orth. mmm (2/m 2/m 2/m) : Pmna
18.2.15Aeschynite-(Y)(Y,Ln,Ca,Th)(Ti,Nb)2(O,OH)6Orth. mmm (2/m 2/m 2/m) : Pmna
18.2.16Nioboaeschynite-(Ce)(Ce,Ca)(Nb,Ti)2(O,OH)6Orth.
18.2.17Nioboaeschynite-(Nd)(Nd,Ce,Ca,Th)(Nb,Ti,Fe,Ta)2(O,OH)6Orth.
18.2.18Tantalaeschynite-(Y)Y(Ta,Ti,Nb)2O6Orth. mmm (2/m 2/m 2/m)
18.2.19Vigezzite(Ca,Ce)(Nb,Ta,Ti)2O6Orth.
18.2.20Murataite-(Y)(Y,Na)6Zn(Zn,Fe3+)4(Ti,Nb,Na)12O29(O,F,OH)10F4 Iso. m3m (4/m 3 2/m) : Fm3m

Other InformationHide

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)Hide

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)Hide

Localities for Aeschynite-(Nd)Hide

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 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
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 District
        • 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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