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Foordite

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Eugene Edward Foord
Formula:
Sn2+Nb2O6
System:
Monoclinic
Colour:
Dark brown, Yellowish ...
Lustre:
Adamantine, Sub-Adamantine, Dull
Hardness:
6
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.


Classification of Foordite

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

Physical Properties of Foordite

Adamantine, Sub-Adamantine, Dull
Diaphaneity (Transparency):
Translucent
Comment:
Dull on eroded surfaces
Colour:
Dark brown, Yellowish brown, olive brown.
Streak:
Yellowish white
Hardness (Mohs):
6
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 Foordite

Type:
Biaxial (+)
Dispersion:
strong

Chemical Properties of Foordite

IMA Formula:
Sn2+Nb2O6
Elements listed in formula:
Common Impurities:
Pb

Crystallography of Foordite

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 Volume:
V 461.87 ų (Calculated from Unit Cell)
Comment:
C2/c
X-Ray 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 Foordite

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

Relationship of Foordite to other Species

Series:
Forms a series with Thoreaulite (see here)
Member of:
Other Members of Group:
Thoreaulite(Sn2+,Pb)(Ta,Nb)2O6
4.DG.05Euxenite-(Y)(Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6
4.DG.05Fersmite(Ca,Ce,Na)(Nb,Ta,Ti)2(O,OH,F)6
4.DG.05Kobeite-(Y)(Y,U)(Ti,Nb)2(O,OH)6
4.DG.05Loranskite-(Y)(Y,Ce,Ca)(Zr,Ta)2O6
4.DG.05Polycrase-(Y)Y(Ti,Nb)2(O,OH)6
4.DG.05Tanteuxenite-(Y)Y(Ta,Nb,Ti)2(O,OH)6
4.DG.05Uranopolycrase(U,Y)(Ti,Nb,Ta)2(O,OH)6
4.DG.05Yttrocrasite-(Y)(Y,Th,Ca,U)(Ti,Fe)2(O,OH)6
4.DG.10Fergusonite-(Y)-βYNbO4
4.DG.10Fergusonite-(Nd)-βNdNbO4
4.DG.10Fergusonite-(Ce)-βCeNbO4
4.DG.10Yttrotantalite-(Y)(Y,U,Fe2+)(Ta,Nb)2(O,OH)4
4.DG.10Beta-Fergusonite-(Nd)(Nd,Ce)NbO4
4.DG.15ThoreauliteSn2+Ta2O6
4.DG.20RaspitePbWO4
18.1.1LithiotantiteLiTa3O8
18.1.2LueshiteNaNbO3
18.1.3NatroniobiteNaNbO3
18.1.4FranconiteNaNb2O5(OH) · 3H2O
18.1.5NatrotantiteNa2Ta4O11
18.1.6IrtyshiteNa2Ta4O11
18.1.7Rankamaite(Na,K,Pb)(Ta,Nb,Al)4(O,OH)10
18.1.8Hydropyrochlore(H2O,◻)2Nb2(O,OH)6(H2O)
18.1.9CalciotantiteCaTa4O11
18.1.10RynersoniteCaTa2O6
18.1.11Microlite Group(Ca,Na)2Ta2(O,OH,F)7
18.1.12BelyankiniteCa1-2(Ti,Zr,Nb)5O12 · 9H2O
18.1.13LatrappiteCa2NbFe3+O6
18.1.14HochelagaiteCaNb4O11 · 8H2O
18.1.15Bariomicrolite (of Hogarth 1977)
18.1.16ParabariomicroliteBaTa4O10(OH)2 · 2H2O
18.1.17Bariopyrochlore (of Hogarth 1977)A2Nb2(O,OH)6Z
18.1.18AlumotantiteAlTaO4
18.1.19SimpsoniteAl4Ta3O13(OH)
18.1.20SosedkoiteK5Al2Ta22O60
18.1.21ThoreauliteSn2+Ta2O6
18.1.22Stannomicrolite (of Hogarth 1977)
18.1.24ChangbaiitePbNb2O6
18.1.25Plumbopyrochlore (of Skorobogatova et al.)A2Nb2(O,OH)6Z
18.1.26Plumbomicrolite (of Hogarth 1977)
18.1.27StibiocolumbiteSbNbO4
18.1.28StibiotantaliteSb3+TaO4
18.1.29Natrobistantite
18.1.30CesplumtantiteCs2Pb3Ta8O24
18.1.31Stibiomicrolite (of Groat et al.)
18.1.32Cesstibtantite
18.1.34BismutotantaliteBiTaO4
18.1.35Bismutomicrolite (of Hogarth 1977)
18.1.36Tantalite-(Mn)Mn2+Ta2O6
18.1.37GerasimovskiteMn2+(Ti,Nb)5O12 · 9H2O
18.1.38Tapiolite-(Mn)Mn2+Ta2O6
18.1.39Columbite-(Mn)Mn2+Nb2O6
18.1.40WodginiteMn2+Sn4+Ta2O8
18.1.41Ixiolite(Ta,Mn,Nb)O2
18.1.42Columbite-(Fe)Fe2+Nb2O6
18.1.43Tantalite-(Fe)Fe2+Ta2O6
18.1.44Columbite
18.1.45Tantalite(Mn,Fe)(Ta,Nb)2O6
18.1.46Tapiolite(Fe,Mn)(Ta,Nb)2O6
18.1.47Tapiolite-(Fe)Fe2+Ta2O6
18.1.48Columbite-(Mg)MgNb2O6
18.1.50Strüverite(Ti,Ta,Fe)O2
18.1.51 Staringite(Fe,Mn)x(Ta,Nb)2xSn6-3xO12

Other Names for Foordite

Name in Other Languages:
German:Foordit
Russian:Фурдит
Spanish:Foordita

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 Foordite

Reference List:
American Mineralogist: 75: 707.

Canadian Mineralogist: 26: 899-903.

Internet Links for Foordite

mindat.org URL:
https://www.mindat.org/min-1581.html
Please feel free to link to this page.

Localities for Foordite

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.
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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