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Nioboaeschynite-(Y)

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About Nioboaeschynite-(Y)Hide

Formula:
(Y,REE,Ca,Th,Fe)(Nb,Ti,Ta)2(O,OH)6
Colour:
Deep brownish red
Lustre:
Vitreous
Hardness:
5 - 6
Specific Gravity:
5.34
Crystal System:
Orthorhombic
Name:
Named as the niobium analogue of Aeschynite-(Y).
The Nb analogue of Aeschynite-(Y).

Compare the chemically very similar Euxenite-(Y) which has different space-group symmetry. Compare also Fergusonite-(Y).


Classification of Nioboaeschynite-(Y)Hide

Approved
Approval Year:
2006
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
8.3.6.7

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

Physical Properties of Nioboaeschynite-(Y)Hide

Vitreous
Transparency:
Translucent
Colour:
Deep brownish red
Comment:
Otherwise it is dark, almost black
Streak:
Grayish brown
Hardness:
5 - 6 on Mohs scale
Hardness:
VHN100=922 kg/mm2 - Vickers
Hardness Data:
Measured
Cleavage:
None Observed
Fracture:
Conchoidal
Density:
5.34 g/cm3 (Measured)    5.33 g/cm3 (Calculated)

Optical Data of Nioboaeschynite-(Y)Hide

Type:
Isotropic
Reflectivity:
470 nmR1=3.4%R2=14.6%
546nmR1=3.3%R2= 14.1%
589nmR1=3.2%R2= 13.8%
650nmR1=3.2%R2=13.7%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 14.6%.
R1 shown in black, R2 shown in red

Chemical Properties of Nioboaeschynite-(Y)Hide

Formula:
(Y,REE,Ca,Th,Fe)(Nb,Ti,Ta)2(O,OH)6
Common Impurities:
Fe,Ta

Crystallography of Nioboaeschynite-(Y)Hide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pban
Cell Parameters:
a = 5.279 Å, b = 10.966 Å, c = 7.443 Å
Ratio:
a:b:c = 0.481 : 1 : 0.679
Unit Cell V:
430.87 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.009 (100)
2.931 (69)
3.079 (20)
1.580 (16)
1.863 (14)
2.783 (12)
2.636 (12)
2.006 (11)

Type Occurrence of Nioboaeschynite-(Y)Hide

Associated Minerals at Type Locality:
Reference:
Bermanec, V., Tomašić, N., Kniewald, G., Back, M.E., Zagler, G. (2008): Nioboaeschynite-(Y), a new member of the aeschynite group from the Bear Lake diggings, Haliburton County, Ontario, Canada. Canadian Mineralogist: 46: 395-402.

Synonyms of Nioboaeschynite-(Y)Hide

Other Language Names for Nioboaeschynite-(Y)Hide

Simplified Chinese:铌钇易解石

Relationship of Nioboaeschynite-(Y) 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-(Nd)(Nd,Ln,Ca)(Ti,Nb)2(O,OH)6Orth. mmm (2/m 2/m 2/m)
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.
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.

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-(Nd)(Nd,Ln,Ca)(Ti,Nb)2(O,OH)6Orth. mmm (2/m 2/m 2/m)
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.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)
8.3.6.5Aeschynite-(Nd)(Nd,Ln,Ca)(Ti,Nb)2(O,OH)6Orth. mmm (2/m 2/m 2/m)

Other InformationHide

Health Risks:
Radioactive

References for Nioboaeschynite-(Y)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Bermanec, V., Tomašić, N., Kniewald, G., Back, M.E., Zagler, G. (2008): Nioboaeschynite-(Y), a new member of the aeschynite group from the Bear Lake diggings, Haliburton County, Ontario, Canada. Canadian Mineralogist: 46: 395-402.

Internet Links for Nioboaeschynite-(Y)Hide

Localities for Nioboaeschynite-(Y)Hide

ⓘ - 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 (TL)
 
  • Ontario
    • Haliburton Co.
      • Monmouth Township
Bermanec V, Tomašić N, Kniewald G, Back M E, Zagler G (2008) Nioboaeschynite-(Y), a new member of the aeschynite group from the Bear Lake diggings, Haliburton County, Ontario, Canada, The Canadian Mineralogist 46, 395-402
    • Renfrew Co.
Specimen obtained from and analyzed by Gunnar Färber.
  • Québec
    • Nord-du-Québec
      • Nunavik
Mitchell, R.H. & Smith, D.L. (2017) Geology and mineralogy of the Ashram zone carbonatite, Eldor complex, Quebec. Ore Geology Reviews 86, 784-806.
Finland
 
  • Northern Finland Region
    • Pyhäntä
Al Ani Thair and Torppa Akseli 2011. REE-Nb mineralogy in Katajakangas and Lamujärvi alkaline rocks, Central Finland
South Korea
 
  • Chungcheongbukdo (Chungchong-pukto)
    • Chungju (Chung Won Kum; Chung-ju)
      • Joongwon-gun
        • Mt. Eorae
Pavel M. Kartashov analytical data
Mineral and/or Locality  
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