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UM1987-03-O:FePbTiU

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Formula:
~(U,Pb)(Ti,Fe3+,Fe2+,Mn)21O38
more specifically: (U,Pb)[Ti12Fe3+5Fe2+2Mn2]O38
Crystal System:
Trigonal
Reported as "REE-free davidite", which forms crystals (rhombohedral, thus isometric in appearance), up to 2 mm in size, occurring in fissures within gneiss; associated minerals include: quartz (smoky q. variety), rutile, chernovite, and hematite. The locality is reported as Pizzo Cervandone.
Compare cleusonite.


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Chemical Properties of UM1987-03-O:FePbTiUHide

Formula:
~(U,Pb)(Ti,Fe3+,Fe2+,Mn)21O38

more specifically: (U,Pb)[Ti12Fe3+5Fe2+2Mn2]O38

Crystallography of UM1987-03-O:FePbTiUHide

Crystal System:
Trigonal
Class (H-M):
3 - Rhombohedral
Space Group:
R3
Cell Parameters:
a = 10.456(3) Å, c = 21.098(6) Å
Ratio:
a:c = 1 : 2.018
Unit Cell V:
1,997.57 ų (Calculated from Unit Cell)
Comment:
The system, class, and space group set as those of the other group members, but not reported by the authors

Relationship of UM1987-03-O:FePbTiU to other SpeciesHide

Other Members of this group:
AlmeidaitePbZn2(Mn,Y)(Ti,Fe3+)18O37(OH,O)Trig. 3 : R3
Cleusonite(Pb,Sr)(U4+,U6+)(Fe2+,Zn)2(Ti,Fe2+,Fe3+)18(O,OH)38Trig. 3 : R3
CrichtoniteSr(Mn,Y,U)Fe2(Ti,Fe,Cr,V)18(O,OH)38Trig. 3 : R3
Davidite-(Ce)(Ce,La)(Y,U,Fe)(Ti,Fe)20(O,OH)38Trig. 3 : R3
Davidite-(La)(La,Ce)(Y,U,Fe)(Ti,Fe)20(O,OH)38Trig.
Davidite-(Y)(La,Ce,Na,Ca,Pb)(Y,Fe2+,◻)(Fe2+,Mn2+)2(Ti,Fe3+,Nb,Zr)18O38 (hypothetical)Trig.
Dessauite-(Y)(Sr,Pb)(Y,U)(Ti,Fe3+)20O38Trig. 3 : R3
Gramaccioliite-(Y)(Pb,Sr)(Y,Mn)Fe3+2(Ti,Fe3+)18O38Trig. 3
LandauiteNaMnZn2(Ti,Fe)6Ti12O38Trig. 3 : R3
Lindsleyite(Ba,Sr)(Zr,Ca)(Fe,Mg)2(Ti,Cr,Fe)18O38Trig.
Loveringite(Ca,Ce,La)(Zr,Fe)(Mg,Fe)2(Ti,Fe,Cr,Al)18O38Trig.
Mapiquiroite(Sr,Pb)(U,Y)Fe2(Ti,Fe3+,Cr3+)18O38Trig. 3 : R3
Mathiasite(K, Ba, Sr)(Zr, Fe)(Mg,Fe)2 (Ti,Cr,Fe)18O38Trig.
Mianningite(◻,Pb,Ce,Na)(U4+,Mn,U6+)Fe3+2 (Ti,Fe3+)18O38Trig. 3 : R3
PaseroitePbMn2+(Mn2+,Fe3+)2(V5+,Ti,◻)18O38 Trig. 3 : R3
SenaitePb(Mn,Y,U)(Fe,Zn)2(Ti,Fe,Cr,V)18(O,OH)38Trig.
Unnamed (HBU UK-4)NaFe2+Zn2(Ti,Fe3+,Nb)6Ti12O38Trig. 3 : R3

Other InformationHide

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 UM1987-03-O:FePbTiUHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Stalder, H.A., Bühler, Ch. (1987) Geochemistry of crichtonite group minerals from Alpine fissures. Schweiz. Mineral. Petrogr. Mitt.: 67: 93-102 (in German); in: Jambor, J.L., Burke, E.A.J. (1989): New mineral Names. American Mineralogist: 74: 1401
Smith, D.G.W., Nickel, E.H. (2007): A System of Codification for Unnamed Minerals: Report of the SubCommittee for Unnamed Minerals of the IMA Commission on New Minerals, Nomenclature and Classification. Canadian Mineralogist: 45: 983-1055; http://nrmima.nrm.se (2016)

Internet Links for UM1987-03-O:FePbTiUHide

Localities for UM1987-03-O:FePbTiUHide

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.
Italy
 
  • Piedmont
    • Verbano-Cusio-Ossola Province
      • Ossola Valley
        • Antigorio Valley
          • Devero Valley
            • Baceno
              • Devero Alp
                • Mt. Cervandone area (Scherbadung; Cherbadung)
Stalder, H.A., Bühler, Ch. (1987) Geochemistry of crichtonite group minerals from Alpine fissures. Schweiz. Mineral. Petrogr. Mitt.: 67: 93-102 (in German); in: Jambor, J.L., Burke, E.A.J. (1989): New mineral Names. American Mineralogist: 74: 1401
Mineral and/or Locality  
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