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Foordite

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Eugene Edward Foord
Formula:
Sn2+(Nb,Ta)2O6
Colour:
Dark brown, Yellowish brown, olive brown.
Lustre:
Adamantine, Sub-Adamantine, Dull
Hardness:
6
Specific Gravity:
6.73
Crystal System:
Monoclinic
Member of:
Name:
Named by Petr Cerny, Andre M. Fransolet, T. Scott Ercit, and R. Chapman in 1988 in honor of Eugene Edward Foord [November 20, 1946 - January 8, 1998 Golden, Colorado, USA], mineralogist of the U. S. Geological Survey and specialist in granite pegmatite research.
Isostructural with:
Dark brown to bronzey masses.


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Classification of FoorditeHide

Approved
4.DG.15

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
8.3.10.2

8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
3 : AB2O6
18.1.23

18 : Niobates and Tantalates
1 : Niobates and tantalates containing neither rare earths nor U

Pronounciation of FoorditeHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of FoorditeHide

Adamantine, Sub-Adamantine, Dull
Transparency:
Translucent
Comment:
Dull on eroded surfaces
Colour:
Dark brown, Yellowish brown, olive brown.
Streak:
Yellowish white
Hardness:
Tenacity:
Brittle
Cleavage:
Perfect
{100}, also {011} poor
Fracture:
Irregular/Uneven
Density:
6.73 g/cm3 (Measured)    6.66 g/cm3 (Calculated)

Optical Data of FoorditeHide

Type:
Biaxial (+)
Dispersion:
strong

Chemical Properties of FoorditeHide

Formula:
Sn2+(Nb,Ta)2O6
IMA Formula:
Sn2+Nb2O6
Common Impurities:
Pb

Crystallography of FoorditeHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Cell Parameters:
a = 17.09 Å, b = 4.87 Å, c = 5.55 Å
β = 90.85°
Ratio:
a:b:c = 3.509 : 1 : 1.14
Unit Cell V:
461.87 ų (Calculated from Unit Cell)
Comment:
C2/c

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.59 (40)
3.10 (50)
3.07 (50)
2.85 (100)
2.78 (20)
1.853 (30)
1.694 (50)
1.681 (50)
Comments:
45-1350

Type Occurrence of FoorditeHide

Geological Setting of Type Material:
Found as small masses and pebbles in alluvium, presumably derived from a granite pegmatite.

Synonyms of FoorditeHide

Other Language Names for FoorditeHide

German:Foordit
Russian:Фурдит
Spanish:Foordita

Relationship of Foordite to other SpeciesHide

Member of:
Other Members of this group:
Thoreaulite(Sn2+,Pb)(Ta,Nb)2O6Mon.
Forms a series with:

Related Minerals - Nickel-Strunz GroupingHide

4.DG.05Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6Orth. mmm (2/m 2/m 2/m)
4.DG.05Fersmite(Ca,Ce,Na)(Nb,Ta,Ti)2(O,OH,F)6Orth. mmm (2/m 2/m 2/m) : Pbcn
4.DG.05Kobeite-(Y)(REE,Fe,U)3 Zr(Ti,Nb)3 O12
4.DG.05Loranskite-(Y)(Y,Ce,Ca)ZrTaO6 (?)
4.DG.05Polycrase-(Y)Y(Ti,Nb)2(O,OH)6Orth. mmm (2/m 2/m 2/m)
4.DG.05Tanteuxenite-(Y)Y(Ta,Nb,Ti)2(O,OH)6
4.DG.05Uranopolycrase(U4+,Y)(Ti,Nb)2O6Orth. mmm (2/m 2/m 2/m) : Pbcn
4.DG.05Yttrocrasite-(Y)(Y,Th,Ca,U)(Ti,Fe)2(O,OH)6Amor.
4.DG.10Fergusonite-(Y)-βYNbO4Mon. 2/m
4.DG.10Fergusonite-(Nd)-β(Nd,Ce)NbO4
4.DG.10Fergusonite-(Ce)-β(Ce,La,Nd)NbO4
4.DG.10Yttrotantalite-(Y)(Y,U4+,Fe2+)(Ta,Nb)(O,OH)4Orth.
4.DG.10Beta-Fergusonite-(Nd)(Nd,Ce)NbO4
4.DG.15Thoreaulite(Sn2+,Pb)(Ta,Nb)2O6Mon.
4.DG.20RaspitePb(WO4)Mon. 2/m : P21/b

Related Minerals - Dana Grouping (8th Ed.)Hide

8.3.10.1Thoreaulite(Sn2+,Pb)(Ta,Nb)2O6Mon.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

18.1.1LithiotantiteLiTa3O8Mon.
18.1.2LueshiteNaNbO3Orth. mmm (2/m 2/m 2/m)
18.1.3NatroniobiteNaNbO3Mon.
18.1.4FranconiteNa(Nb2O5)(OH) · 3H2OMon.
18.1.5NatrotantiteNa2Ta4O11Mon.
18.1.6IrtyshiteNa2(Ta,Nb)4O11Hex.
18.1.7Rankamaite(Na,K)3(Ta,Nb,Al)11(O,OH)31Orth. mmm (2/m 2/m 2/m) : Cmmm
18.1.8Hydropyrochlore(H2O,□)2Nb2(O,OH)6(H2O)Iso. m3m (4/m 3 2/m) : Fd3m
18.1.9CalciotantiteCaTa4O11Hex.
18.1.10RynersoniteCaTa2O6Orth. mmm (2/m 2/m 2/m)
18.1.11Microlite GroupIso. m3m (4/m 3 2/m) : Fd3m
18.1.12BelyankiniteCa1-2(Ti,Nb)5O12 · 9H2O (?)Amor.
18.1.13LatrappiteCa2NbFe3+O6Orth. mmm (2/m 2/m 2/m) : Pnma
18.1.14Hochelagaite(Ca,Na,Sr)(Nb,Ti,Si,Al)4O11 · 8H2OMon.
18.1.15Bariomicrolite (of Hogarth 1977)Iso. m3m (4/m 3 2/m) : Fd3m
18.1.16ParabariomicroliteBaTa4O10(OH)2 · 2H2OTrig.
18.1.17Bariopyrochlore (of Hogarth 1977)A2Nb2(O,OH)6ZIso. m3m (4/m 3 2/m) : Fd3m
18.1.18AlumotantiteAlTaO4Orth. mmm (2/m 2/m 2/m) : Pbcn
18.1.19SimpsoniteAl4(Ta,Nb)3O13(OH,F)Trig. 3 : P3
18.1.20Sosedkoite(K,Na)5Al2(Ta,Nb)22O60Orth.
18.1.21Thoreaulite(Sn2+,Pb)(Ta,Nb)2O6Mon.
18.1.22Stannomicrolite (of Hogarth 1977)
18.1.24ChangbaiitePbNb2O6Trig.
18.1.25Plumbopyrochlore (of Skorobogatova et al.)A2Nb2(O,OH)6Z
18.1.26Plumbomicrolite (of Hogarth 1977)
18.1.27StibiocolumbiteSb(Nb,Ta)O4Orth. mm2
18.1.28StibiotantaliteSb(Ta,Nb)O4Orth. mm2
18.1.29NatrobistantiteIso.
18.1.30Cesplumtantite(Cs,Na)2(Pb,Sb3+)3Ta8O24Tet.
18.1.31Stibiomicrolite (of Groat et al.)
18.1.32Cesstibtantite
18.1.34BismutotantaliteBi(Ta,Nb)O4Orth.
18.1.35Bismutomicrolite (of Hogarth 1977)Iso. m3m (4/m 3 2/m) : Fd3m
18.1.36Tantalite-(Mn)MnTa2O6Orth. mmm (2/m 2/m 2/m) : Pbcn
18.1.37Gerasimovskite(Mn,Ca)(Nb,Ti)5O12 · 9H2O
18.1.38Tapiolite-(Mn)(Mn,Fe)(Ta,Nb)2O6Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
18.1.39Columbite-(Mn)(Mn,Fe)(Nb,Ta)2O6Orth. mmm (2/m 2/m 2/m) : Pbcn
18.1.40WodginiteMn2+Sn4+Ta2O8Mon.
18.1.41Ixiolite(Ta,Nb,Sn,Fe,Mn)4O8Orth.
18.1.42Columbite-(Fe)FeNb2O6Orth. mmm (2/m 2/m 2/m) : Pbcn
18.1.43Tantalite-(Fe)FeTa2O6Orth. mmm (2/m 2/m 2/m) : Pbcn
18.1.44ColumbiteOrth. mmm (2/m 2/m 2/m) : Pbcn
18.1.45Tantalite(Mn,Fe)(Ta,Nb)2O6
18.1.46Tapiolite(Fe,Mn)(Ta,Nb)2O6Tet. 4/mmm (4/m 2/m 2/m)
18.1.47Tapiolite-(Fe)(Fe,Mn)(Ta,Nb)2O6Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
18.1.48Columbite-(Mg)(Mg,Fe,Mn)(Nb,Ta)2O6Orth.
18.1.50Strüverite(Ti,Ta,Fe)O2
18.1.51 Staringite(Fe,Mn)x(Ta,Nb)2xSn6-3xO12

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 FoorditeHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
American Mineralogist: 75: 707.
Canadian Mineralogist: 26: 899-903.

Internet Links for FoorditeHide

Localities for FoorditeHide

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.
Democratic Republic of Congo (Zaïre)
 
  • Katanga (Shaba)
T. Witzke, unpublished microprobe analysis
  • Kivu
    • Punia
Kristiansen, R. (2001): Sjeldne tantalniobater fra Sentral-Afrika. eksotiske minerallokaliteter II (Exotic mineral-locations II). STEIN 28 (2): 21-28; Daltry, V. and O. von Korring (1998) Type-mineralogy of Rawanda with particular reference to the Buranga pegmatite. Geologica Belgica 1:9-11.
Kristiansen, R. (2001): Sjeldne tantalniobater fra Sentral-Afrika. eksotiske minerallokaliteter II (Exotic mineral-locations II). STEIN 28 (2): 21-28
Rwanda (TL)
 
  • Western Province
    • Kabaya District
      • Sebeya river
Canadian Mineralogist (1988) 26, 889; Am. Min. (1990) 75, 707 ; Daltry, V. and O. von Korring (1998) Type-mineralogy of Rawanda with particular reference to the Buranga pegmatite. Geologica Belgica 1:9-11.
Mineral and/or Locality  
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