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Pyrochlore Group

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Madagascar



A group of cubic complex oxides comprising the Pyrochlore Subgroup, the Microlite Subgroup and the Betafite Subgroup. See also the related Stibiconite Group.

Classification of Pyrochlore Group

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Relationship of Pyrochlore Group to other Species

Minerals in Group:
Bariomicrolite:
Ba(Ta,Nb)
 
2
(O,OH)
 
7
Betafite:
(Ca,U)
 
2
(Ti,Nb)
 
2
O
 
6
(OH)
Bismutomicrolite:
(Bi,Ca)(Ta,Nb)
 
2
O
 
6
(OH)
Bismutopyrochlore:
(Bi,U,Ca,Pb)
 
1+x
(Nb,Ta)
 
2
O
 
6
(OH)·nH
 
2
O
Calciobetafite:
(Ca,RE,Th,U)
 
2
(Nb,Ta,Ti)
 
2
O
 
7
Kalipyrochlore:
(K,Sr)
 
2-x
Nb
 
2
O
 
6
(O,OH)·nH
 
2
O
Microlite:
(Ca,Na)
 
2
Ta
 
2
O
 
6
(O,OH,F)
Natrobistantite:
(Na,Cs)Bi(Ta,Nb,Sb)
 
4
O
 
12
Plumbobetafite:
(Pb,U,Ca)(Ti,Nb)
 
2
O
 
6
(OH,F)
Plumbomicrolite:
(Pb,Ca,U)
 
2-x
(Ta,Nb,Sn)
 
2
O
 
6
(O,[])
Plumbopyrochlore:
(Pb,Ca,Y,U)
 
2-x
(Nb,Ta,Ti)
 
2
O
 
6
(OH,O)
Pyrochlore:
(Ca,Na)
 
2
Nb
 
2
O
 
6
(OH,F)
Stannomicrolite:
(Sn,Fe,Mn)
 
2
(Ta,Nb,Sn)
 
2
(O,OH)
 
7
Stibiobetafite:
(Sb,Ca)
 
2
(Ti,Nb,Ta)
 
2
(O,OH)
 
7
Stibiomicrolite:
(Sb,Ca,Na)
 
2
(Ta,Nb)
 
2
O
 
7
Uranmicrolite:
(U,Ca,Ce)
 
2
(Ta,Nb)
 
2
O
 
6
(OH,F)
Uranpyrochlore:
(U,Ca,Ce)
 
2
(Nb,Ta)
 
2
O
 
6
(OH,F)
Yttrobetafite-(Y):
(Y,U,Ce)
 
2
(Ti,Nb,Ta)
 
2
O
 
6
OH
Yttropyrochlore-(Y):
(Y,Ca,U)
 
1-2
(Nb,Ta,Ti)
 
2
(O,OH)
 
7

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 Pyrochlore Group

Reference List:Pyatenko, Y.A. (1959) Crystal chemistry and characteristics of minerals of pyrochlore group. Kristallografiya: 4: 204-208 (English abstract).

Hogarth, D.D. (1977) Classification and nomenclature of the pyrochlore group. American Mineralogist: 62: 403-410.

Chakoumakos, B.C. (1984) Systematics of the pyrochlore structure type, ideal A2B2X6Y. Journal of Solid State Chemistry: 53: 120-129.

Greegor, R.B., Lytle, F.W., Chakoumakos, B.C., Lumpkin, G.R., and Ewing, R.C. (1985) An investigation of metamict and annealed pyrochlores by X-ray absorption spectroscopy. In C.M. jantzen, J.A. Stone, and R.C. Ewing, Eds., Scientific Basis for Nuclear Waste Management VIII: 655-662. Materials Research Society, Pittsburgh.

Lumpkin, G.R., Foltyn, E.M., and Ewing, R.C. (1986) Thermal recrystallization of alpha-recoil damaged minerals of the pyrochlore structure type. Journal of Nuclear Materials: 139: 113-120.

Lumpkin, G.R. and Ewing, R.C. (1988) Alpha-decay damage in minerals of the pyrochlore group. Physics and Chemistry of Minerals: 16: 220.

Lumpkin, G.R. and Ewing, R.C. (1992) Geochemical alteration of pyrochlore group minerals: Microlite subgroup. American Mineralogist: 77: 179-188.

Johan, V. and Johan, Z. (1994) Accessory minerals of the Cinovec (Zinnwald) granite cupola, Czech Republic Part 1: Nb-, Ta-, and Ti-bearing oxides. Mineralogy and Petrology: 51: 323-343.

Lumpkin, G.R. and Ewing, R.C. (1995) Geochemical alteration of pyrochlore group minerals: Pyrochlore subgroup. American Mineralogist: 80: 732-743.

Lumpkin, G.R. and Ewing, R.C. (1996) Geochemical alteration of pyrochlore group minerals: Betafite subgroup. American Mineralogist: 81: 1237-1248.

Hogarth, D.D., Williams, C.T., and Jones, P. (2000) Primary zoning in pyrochlore group minerals from carbonatites. Mineralogical Magazine: 64: 683-697.

Nasraoui, M. and Waerenborgh, J.C. (2001) Fe speciation in weathered pyrochlore-group minerals from the Lueshe and Araxá (Barreiro) carbonatites by 57Fe Mössbauer spectroscopy. Canadian Mineralogist: 39: 1073-1080.

Chakhmouradian, A.R. and Mitchell, R.H. (2002) New data on pyrochlore- and perovskite-group minerals from the Lovozero alkaline complex, Russia. European Journal of Mineralogy: 14: 821-836.

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    Localities for Pyrochlore Group

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    The 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. ? 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
     
    • Latium
      • Rome Province
        • Trevignano Romano
    		Gresta, S., Duronio, F., Mancinella D. (2002): Geositi e Sistema delle Aree Protette del Lazio: idee per la geoconservazione. Il Cercapietre. Not. del Gruppo Mineralogico Romano, 1-2: 48-55
    Madagascar
     
    • Antananarivo Province
      • Vakinankaratra Region (Betafo - Antsirabé region)
        • Betafo District
          • Ambohimanambola Commune
            • Mount Ikaka
    		Pezzotta, F. (1999): Madagaskar- Da Paradies der Mineralien und Edelsteine. Extra Lapis 17. 56-59
          • Mahaiza Commune
    		http://www.minsocam.org/MSA/Special/Pig/PIG_articles/Madagascar_txt.pdf
        • Sahatany Pegmatite Field (Mt Bity (Ibity) area)
          • Sahatany Valley
    		Lefevre & Thomas (1998): Les pegmatites de la vallée de la Sahatany, Madagascar. La Règne Minéral, p. 19, 15-28
    K.E.Larsen collection
    • Tuléar (Toliara) Province
      • Anosy (Fort Dauphin) Region
        • Amboasary District
          • Tranomaro Commune
    		Pezzotta, F.(2004): Der Pegmatit von Anjahamiary bei Fort Dauphin, Madagaskar. LAPIS 29 (2): 24-28
    Mineral and/or Locality
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