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Fergusonite-(Y)

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Formula:
YNbO4
System:
Tetragonal
Colour:
Grey, yellow, brown
Hardness:
5½ - 6½
Name:
After Robert Ferguson (1767-1840), Scottish landowner, politician and mineral collector.
This page provides mineralogical data about Fergusonite-(Y).

Classification of Fergusonite-(Y)

Approved
7.GA.05

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
G : Molybdates, Wolframates and Niobates
A : Without additional anions or H2O
8.1.1.1

8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
1 : ABO4
18.2.1

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

Occurrences of Fergusonite-(Y)

Geological Setting:
Rare earth bearing pegmatites, placer deposits.

Physical Properties of Fergusonite-(Y)

Vitreous, Sub-Metallic, Dull
Diaphaneity (Transparency):
Opaque
Colour:
Grey, yellow, brown
Comment:
Brownish black when altered, brown in transmitted light.
Streak:
Brown, yellow brown, greenish gray
Hardness (Mohs):
5½ - 6½
Tenacity:
Brittle
Cleavage:
Poor/Indistinct
Poor on {111}
Fracture:
Sub-Conchoidal
Density:
5.6 - 5.8 g/cm3 (Measured)    5.65 g/cm3 (Calculated)

Crystallography of Fergusonite-(Y)

Crystal System:
Tetragonal
Class (H-M):
4/m - Dipyramidal
Space Group:
I41/a
Cell Parameters:
a = 5.15Å, c = 10.089Å
Ratio:
a:c = 1 : 1.959
Unit Cell Volume:
V 267.59 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Prismatic to acicular dipyramidal crystals to 20cm.
Comment:
Commonly metamict

Optical Data of Fergusonite-(Y)

Type:
Isotropic
RI values:
n = 2.05 - 2.19
Max Birefringence:
δ = 0.000 - Isotropic minerals have no birefringence
Surface Relief:
Very High
Comments:
Rarely uniaxial

Chemical Properties of Fergusonite-(Y)

Formula:
YNbO4
Essential elements:
All elements listed in formula:

Relationship of Fergusonite-(Y) to other Species

7.GA.05Fergusonite-(Ce)(Ce,La,Nd)NbO4
7.GA.05Fergusonite-(Nd)(Nd,Ce)(Nb,Ti)O4
7.GA.05PowelliteCa(MoO4)
7.GA.05ScheeliteCa(WO4)
7.GA.05StolzitePb(WO4)
7.GA.05WulfenitePb(MoO4)
7.GA.10Formanite-(Y)YTaO4
7.GA.10Iwashiroite-(Y)Y(Ta,Nb)O4
7.GA.15Paraniite-(Y)Ca2Y(AsO4)(WO4)2
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
18.2.14Aeschynite-(Nd)(Nd,Ce,Ca)(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 Fergusonite-(Y)

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 Fergusonite-(Y)

Reference List:
Soviet Physics – Crystallography: 26(1): 35-37.

Internet Links for Fergusonite-(Y)

Localities for Fergusonite-(Y)

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.
Mineral and/or Locality  
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