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Petscheckite

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Formula:
UFe(Nb,Ta)2O8
System:
Hexagonal
Colour:
Black
Hardness:
5
Name:
For Eckehard Petsch (1939-), of Idar-Oberstein, Germany, a prospector in Madagascar.
Due to the metamict and altered state of the type petscheckite, the mineral is not well-described. The type was altered into partially iron-leached and oxidized phases designated " oxy-petscheckite" and "hydroxy-petscheckite". Thus the original material was hypothesized on theoretical ground.


Classification of Petscheckite

Approved
Approval Year:
1975
4.DH.35

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
H : With large (+- medium-sized) cations; sheets of edge-sharing octahedra
8.1.9.2

8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
1 : ABO4
18.3.5

18 : Niobates and Tantalates
3 : Niobates and tantalates containing U but not rare earths

Physical Properties of Petscheckite

Diaphaneity (Transparency):
Opaque
Colour:
Black
Streak:
Brownish black
Hardness (Mohs):
5

Chemical Properties of Petscheckite

Formula:
UFe(Nb,Ta)2O8
IMA Formula:
U4+Fe2+Nb2O8
Elements listed in formula:

Crystallography of Petscheckite

Crystal System:
Hexagonal
Cell Parameters:
a = 6.42 Å, c = 4.02 Å
Ratio:
a:c = 1 : 0.626
Unit Cell Volume:
V 143.49 ų (Calculated from Unit Cell)

Type Occurrence of Petscheckite

General Appearance of Type Material:
Metamict crystals up to 4 cm long and 2 cm thick with a greybrown, brown, yellow or white crust of varying thickness.
Geological Setting of Type Material:
A beryl-columbite subtype LCT granite pegmatite
Associated Minerals at Type Locality:

Relationship of Petscheckite to other Species

4.DH.05Brannerite(U4+,REE,Th,Ca)(Ti,Fe3+,Nb)2(O,OH)6
4.DH.05OrthobranneriteU4+U6+Ti4O12(OH)2
4.DH.05Thorutite(Th,U,Ca)Ti2(O,OH)6
4.DH.10KassiteCaTi2O4(OH)2
4.DH.10Lucasite-(Ce)CeTi2(O,OH)6
4.DH.15Bariomicrolite (of Hogarth 1977)
4.DH.15Bariopyrochlore (of Hogarth 1977)A2Nb2(O,OH)6Z
4.DH.15Betafite (of Hogarth 1977)A2-mB2X6-wY1-n
4.DH.15Bismutomicrolite (of Hogarth 1977)
4.DH.15Calciobetafite (of Mazzi & Munno)(Ca,Na)2(Nb,Ti)2(O,OH)7
4.DH.15Ceriopyrochlore (of Hogarth 1977)A2Nb2(O,OH)6Z
4.DH.15Cesstibtantite
4.DH.15JixianitePb(W,Fe3+)2(O,OH)7
4.DH.15Hydropyrochlore(H2O,□)2Nb2(O,OH)6(H2O)
4.DH.15Natrobistantite
4.DH.15Plumbopyrochlore (of Skorobogatova et al.)A2Nb2(O,OH)6Z
4.DH.15Plumbomicrolite (of Hogarth 1977)
4.DH.15Plumbobetafite (of Hogarth 1977)A2-mB2X6-wY1-n
4.DH.15Stibiomicrolite (of Groat et al.)
4.DH.15Strontiopyrochlore (of Hogarth 1977)A2Nb2(O,OH)6Z
4.DH.15Stannomicrolite (of Hogarth 1977)
4.DH.15Stibiobetafite (of Černý et al.)A2-mB2X6-wY1-n
4.DH.15Uranpyrochlore (of Hogarth 1977)(U,Ca,Ce)2(Nb,Ta)2O6(OH,F)
4.DH.15Yttrobetafite (of Hogarth 1977)A2-mB2X6-wY1-n
4.DH.15Yttropyrochlore (of Hogarth 1977)A2Nb2(O,OH)6Z
4.DH.15Fluornatromicrolite(Na1.5Bi0.5)Ta2O6F
4.DH.15Bismutopyrochlore (of Chukanov et al.)A2Nb2(O,OH)6Z
4.DH.15Hydrokenoelsmoreite2W2O6(H2O)
4.DH.20BismutostibiconiteBi(Sb5+,Fe3+)2O7
4.DH.20BindheimitePb2Sb2O6O
4.DH.20Monimolite
4.DH.20CuproroméiteCu2Sb2(O,OH)7
4.DH.20StetefeldtiteAg2Sb2(O,OH)7
4.DH.20Stibiconite(Sb,O,OH) ?
4.DH.25RosiaitePbSb25+O6
4.DH.30ZirconoliteCaZrTi2O7
4.DH.35LiandratiteU(Nb,Ta)2O8
4.DH.40IngersoniteCa3Mn2+Sb45+O14
4.DH.45PittongiteNa0.22(W,Fe3+)(O,OH)3 · 0.44H2O
18.3.1LiandratiteU(Nb,Ta)2O8
18.3.2Uranmicrolite (of Hogarth 1977)
18.3.3Betafite (of Hogarth 1977)A2-mB2X6-wY1-n
18.3.4Plumbobetafite (of Hogarth 1977)A2-mB2X6-wY1-n
18.3.6Hydroxy-petscheckiteUFe1/3(Nb,Ta)2O7(O,OH)
18.3.7Oxy-petscheckiteUFe2/3(Nb,Ta)2O8
18.3.8Ashanite(Nb,Ta,U,Fe,Mn)4O8

Other Names for Petscheckite

Name in Other Languages:

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 Petscheckite

Reference List:
- Mücke, A. & Strunz, H. (1978): Petscheckite and liandratite, two new pegmatite minerals from Madagascar. American Mineralogist 63: 941-946
- Tomašić, N., Raade, G. & Bermanec, V. (2004): REE-bearing petscheckite from Tiltvika, Nordland, Norway, and its heating products. Neues Jahrbuch für Mineralogie Monatshefte 2004 (4) : 163-175

Internet Links for Petscheckite

mindat.org URL:
https://www.mindat.org/min-3179.html
Please feel free to link to this page.

Localities for Petscheckite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
Germany
 
  • Bavaria
    • Upper Palatinate
      • Waidhaus
        • Hagendorf
Mücke A., Keck, E. (2008): Untersuchungen an Columbiten und dem mit Columbit verwachsenen Neufund Petscheckit aus dem Pegmatit von Hagendorf-Süd/Oberpfalz, Der Aufschluss, Vol. 59, 373-392
Madagascar (TL)
 
  • Mahajanga Province (Majunga)
    • Betsiboka Region
      • Tsaratanàna District
        • Berere Pegmatite Field
Mücke, A. & Strunz, H. (1978): Petscheckite and liandratite, two new pegmatite minerals from Madagascar. American Mineralogist 63: 941-946
Norway
 
  • Nordland
    • Hamarøy
      • Finnøy
P.M. Kartashov data; Raade, G. & Williams, T. C. (2005): (Y+REE)-dominated analogues of petscheckite from the Tysfjord area, north Norway. GFF. 127: 39
      • Tiltvika
Tomašić, N., Raade, G. & Bermanec, V. (2004): REE-bearing petscheckite from Tiltvika, Nordland, Norway, and its heating products. Neues Jahrbuch für Mineralogie Monatshefte 2004 (4) : 163-175
USA
 
  • Connecticut
    • Middlesex Co.
      • Portland
Found by Fred Davis
  • Wisconsin
    • Marathon Co.
      • Wausau Intrusive Complex
        • Nine Mile pluton
Rocks & Min. (2007) 82:233
Mineral and/or Locality  
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