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Uranopolycrase

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San Piero in Campo, Campo nell'Elba, Elba Island, Livorno Province, Tuscany, Italy
© Stephan Wolfsried

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Formula:
(U
4+
 
,Y)(Ti,Nb)
 
2
O
 
6
System:OrthorhombicColour:Brown-red
Hardness:5 - 6
Name:Named as the uranium-dominant analogue of polycrase-(Y).


Euxenite Group.

The uranium analogue of Polycrase-(Y).

Classification of Uranopolycrase

IMA status:Approved 1990
Strunz 8th edition ID:4/D.19-15
Nickel-Strunz 10th (pending) edition ID:4.DG.05

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
G : With large (+- medium-sized) cations; chains of edge-sharing octahedra
Dana 8th edition ID:8.3.8.5

8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
3 : AB2O6
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Type Occurrence of Uranopolycrase

Type Locality:Fonte del Prete, San Piero in Campo, Campo nell'Elba, Elba Island, Livorno Province, Tuscany, Italy
Year of Discovery:1993

Physical Properties of Uranopolycrase

Lustre:Adamantine
Diaphaneity (Transparency):Opaque
Colour:Brown-red
Hardness (Mohs):5 - 6

Crystallography of Uranopolycrase

Crystal System:Orthorhombic
Class (H-M):mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:Pbcn {P21/b 2/c 21/n}
Cell Parameters:a = 14.51(1) Å, b = 5.558(5) Å, c = 5.173(4) Å
Ratio:a:b:c = 2.611 : 1 : 0.931
Unit Cell Volume:V 417.18 ų (Calculated from Unit Cell)
Z:4
Morphology:Elongated, tabular.
Comment:Crystalline only after heating at 900°C for 10 h; originally metamict.

Chemical Properties of Uranopolycrase

Formula:
(U
4+
 
,Y)(Ti,Nb)
 
2
O
 
6
Essential elements:O, Ti, U
All elements listed in formula:Nb, O, Ti, U, Y
Common Impurities:Th,Mn,Ca,Nd,TR

Relationship of Uranopolycrase to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
4.DG.05Euxenite-(Y)
(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)
 
2
O
 
6
4.DG.05Fersmite
(Ca,Ce,Na)(Nb,Ta,Ti)
 
2
(O,OH,F)
 
6
4.DG.05Kobeite-(Y)
(Y,Zr)
 
2
(Ti,Fe
3+
 
)
 
2
(O,OH)
 
7
4.DG.05Loranskite-(Y)
(Y,Ce,Ca)ZrTaO
 
6
 (?)
4.DG.05Polycrase-(Y)
(Y,U)(Ti,Nb)
 
2
O
 
6
4.DG.05Tanteuxenite-(Y)
(Y,Ce,Ca)(Ta,Nb,Ti)
 
2
(O,OH)
 
6
4.DG.05Yttrocrasite-(Y)
(Y,Th,Ca,U)(Ti,Fe)
 
2
(O,OH)
 
6
4.DG.10β-Fergusonite-(Y)
YNbO
 
4
4.DG.10β-Fergusonite-(Nd)
(Nd,Ce)NbO
 
4
4.DG.10β-Fergusonite-(Ce)
(Ce,La,Nd)NbO
 
4
4.DG.10Yttrotantalite-(Y)
(Y,Ca,U
4+
 
,Fe
2+
 
)
 
2
(Ta,Nb)
 
2
O
 
8
4.DG.10Beta-Fergusonite-(Nd)
4.DG.15Foordite
(Sn,Pb)(Nb,Ta)
 
2
O
 
6
4.DG.15Thoreaulite
SnTa
 
2
O
 
6
4.DG.20Raspite
PbWO
 
4

Other Names for Uranopolycrase

Synonyms:
IMA1990-046
Other Languages:
German:Uranopolykras
Russian:Уранополикраз

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Uranopolycrase

Reference List:European Journal of Mineralogy (1993): 5: 1161-1165.

New Minerals (1997), New Minerals 1990-1994.

Internet Links for Uranopolycrase

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  • Raman and XRD data at RRUFF project
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  • Uranopolycrase details from Handbook of Mineralogy (PDF)
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    Localities for Uranopolycrase

    (TL) indicates type locality. ? 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.
    Italy
     
    • Lombardy
      • Sondrio Province
        • Novate Mezzola
          • Codera Valley
    		Ghizzoni, S. & Mazzoleni, G. (2005): Itinerari mineralogici in val Codera. Geologia Insubrica, Ed., Milano, 316 pp.
    • Tuscany
      • Livorno Province
        • Elba Island
          • Campo nell'Elba
            • San Piero in Campo
    		Giannettoni L., Gini C., Guelfi F., Orlandi P., Sovilla S.: Uranopolicrasio una nuova specie dell'isola d’Elba., Rivista Mineralogica Italiana., n. 4, 237-243. and Aurisicchio C., Orlandi P., Pasero M., Perchiazzi N.(1993): Uranopolycrase, the uranium-dominant analogue of polycrase-(Y), a new mineral from Elba Island, Italy, and its crystal structure. Eur. J. Mineral., 5, 1161-1165. ;
    Orlandi, P., & Pezzotta, F. (1997). Minerali dell'Isola d'Elba. Edizioni Novecento Grafico, Bergamo, 249 pp.
    Orlandi, P., & Pezzotta, F. (1997). Minerali dell'Isola d'Elba. Edizioni Novecento Grafico, Bergamo, 249 pp.
    Switzerland
     
    • Grischun (Grisons; Graubünden)
      • Bregaglia Valley (Bergell)
        • Forno Valley
    		Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Wepf (Basel), p. 156.
    USA
     
    • Texas
      • Burnet Co.
    		Self-Collected by Franklin Roberts
    Mineral and/or Locality
    Google
     
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