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⇱ Aeschynite-(Nd): Mineral information, data and localities.

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Aeschynite-(Nd)

A valid IMA mineral species
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About Aeschynite-(Nd)Hide

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Formula:
Nd(TiNb)O6
Previously given as (Nd,Ln,Ca)(Ti,Nb)2(O,OH)6. Redefined in 2025.
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.
Forms as tabular and prismatic crystals, up to several mm, and as equigranular and radiating crystal clusters, or massive.


Unique IdentifiersHide

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Mindat ID:
38
Long-form identifier:
mindat:1:1:38:9

Similar NamesHide

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AeschyniteA synonym
Aeschynite-(Ce)A valid IMA mineral species - grandfatheredCe(TiNb)O6
Aeschynite-(Ce)-Aeschynite-(Y) SeriesA solid-solution series between two end-member minerals
Aeschynite-(Ce)-Nioboaeschynite-(Ce) SeriesA solid-solution series between two end-member minerals
Aeschynite-(Y)A valid IMA mineral species - grandfatheredY(TiNb)O6
Aeschynite-(Y)-Tantalaeschynite-(Y) SeriesA solid-solution series between two end-member minerals

IMA Classification of Aeschynite-(Nd)Hide

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Approved

Classification of Aeschynite-(Nd)Hide

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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

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.

SymbolSourceReference for Standard
Aes-NdIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43
AesThe Canadian Mineralogist (2019)The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download

Physical Properties of Aeschynite-(Nd)Hide

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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

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

Chemistry of Aeschynite-(Nd)Hide

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Mindat Formula:
Nd(TiNb)O6

Previously given as (Nd,Ln,Ca)(Ti,Nb)2(O,OH)6. Redefined in 2025.
Element Weights:
Element% weight
Nd37.858 %
O25.195 %
Nb24.384 %
Ti12.563 %

Calculated from ideal end-member formula.

Crystallography of Aeschynite-(Nd)Hide

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Crystal System:
Orthorhombic
Class (H-M):
mmm(2/m2/m2/m) - Dipyramidal
Comment:
Metamict, space group nd

X-Ray Powder DiffractionHide

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Powder Diffraction Data:
d-spacingIntensity
1.53 Å(6)
1.575 Å(7)
1.95 Å(6)
2.64 Å(5)
2.93 Å(10)
3.00 Å(9)
5.45 Å(5)
Comments:
Material from Bayan Obo, China, after heating at 800 °C; before heating, only one line at 2.03 A was observed

Geological EnvironmentHide

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Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 4b: Highly evolved igneous rocks>3.0
34 : Complex granite pegmatites
Geological Setting:
In veins in slate and metamorphosed dolostone.

Type Occurrence of Aeschynite-(Nd)Hide

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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:

Synonyms of Aeschynite-(Nd)Hide

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Other Language Names for Aeschynite-(Nd)Hide

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Relationship of Aeschynite-(Nd) to other SpeciesHide

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Other Members of Aeschynite Group:
Aeschynite-(Ce)Ce(TiNb)O6Orth. mmm(2/m2/m2/m) : Pmna
Aeschynite-(Y)Y(TiNb)O6Orth. mmm(2/m2/m2/m) : Pmna
RynersoniteCaTa2O6Orth. mmm(2/m2/m2/m)
Tantalaeschynite-(Ce)Ce(TiTa)O6Orth. mmm(2/m2/m2/m) : Pnma
Tantalaeschynite-(Y)Y(TiTa)O6Orth. mmm(2/m2/m2/m)
'UM2001-09-O:CaNbREESiTiY'(Ca,Y,REE)(Ti,Nb,Si)2(O,OH)6
VigezziteCaNb2O6Orth. mmm(2/m2/m2/m) : Pnma

Common AssociatesHide

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Associated Minerals Based on Photo Data:
1 photo of Aeschynite-(Nd) associated with ZirconZr(SiO4)
1 photo of Aeschynite-(Nd) associated with QuartzSiO2
1 photo of Aeschynite-(Nd) associated with AegirineNaFe3+Si2O6
1 photo of Aeschynite-(Nd) associated with Ferriallanite-(Ce)(CaCe)(Fe3+AlFe2+)O[Si2O7][SiO4](OH)
1 photo of Aeschynite-(Nd) associated with FluoriteCaF2

Related Minerals - Strunz-mindat GroupingHide

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4.DF.05Aeschynite-(Ce)Ce(TiNb)O6Orth. mmm(2/m2/m2/m) : Pmna
4.DF.05Aeschynite-(Y)Y(TiNb)O6Orth. mmm(2/m2/m2/m) : Pmna
4.DF.05Tantalaeschynite-(Y)Y(TiTa)O6Orth. mmm(2/m2/m2/m)
4.DF.05VigezziteCaNb2O6Orth. mmm(2/m2/m2/m) : Pnma
4.DF.05RynersoniteCaTa2O6Orth. mmm(2/m2/m2/m)
4.DF.10ChangbaiitePbNb2O6Trig. 3m : R3m
4.DF.15Murataite-(Y)(Y,Na)6Zn(Zn,Fe3+)4(Ti,Nb,Na)12O29(O,F,OH)10F4 Iso. m3m(4/m32/m) : Fm3m

Other InformationHide

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Magnetism:
Non-Magnetic
Notes:
Radioactive.
The mineral is readily soluble in warm HCl,
H2SO4, H3PO4 and weakly in HNO3.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for Aeschynite-(Nd)Hide

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

References for Aeschynite-(Nd)Hide

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Reference List:

Localities for Aeschynite-(Nd)Hide

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Showing 14 localities.

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the 👁 Image
symbol to view information about a locality. The 👁 Image
symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

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👁 Image
- This locality has map coordinates listed. 👁 Image
- This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. 👁 Image
- Good crystals or important locality for species. 👁 Image
- 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Canada
  • Ontario
    • Renfrew County
      • Brudenell-Lyndoch-and-Raglan
        • Lyndoch Township
          • Quadeville area
ontariominerals.com
  • Québec
    • Nord-du-Québec
      • Nunavik
Beland et al. (2021)
China
  • Inner Mongolia
    • Baotou City (Baotou Prefecture)
      • Bayan Obo mining district
        • Bayan Obo
Yi-Li et al. (2023)
Peishan Zhang and Kejie Tao (1982) +1 other reference
Czech Republic
  • Vysočina Region
    • Třebíč District
Pauliš P. et al. (Kutna Hora, issue 1)
Pauliš P. et al. (Kutna Hora, issue 1)
      • Slavičky
Pauliš P. et al. (Kutna Hora, issue 1)
Mexico
  • Yucatán
    • northwest coastline of the Yucatán peninsula
      • Puerto Chicxulub
Wittmann A (2022)
Romania
  • Harghita County
    • Ditrău Complex
Szakáll et al. (2010)
Russia
  • Chelyabinsk Oblast
    • Kyshtym
webmineral.ru (2020) +1 other reference
  • Irkutsk Oblast
    • Vitim Plateau
      • Biraya and Bya Rivers confluence area (Chara Basin)
  • Krasnoyarsk Krai
    • Enisei Range (Yenisei Ridge; Enisei Ridge)
      • Tatarka Range
Pekov (1998)
South Korea
  • North Chungcheong Province
    • Chungju City
      • Joongwon-gun
        • Mt. Eorae
Pavel.M. Kartashov (n.d.)
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