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Franconite

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Formula:
Na(Nb2O5)(OH) · 3H2O
Colour:
White
Lustre:
Vitreous
Hardness:
4
Specific Gravity:
2.72(1)
Crystal System:
Monoclinic
Name:
Named by J.L. Jambor, A.P. Sabina, A.C. Roberts, M. Bonardi, R.A. Ramik, and B.D. Sturman in 1984 for the type locality of Francon Quarry, Canada.
This page provides mineralogical data about Franconite.


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Classification of FranconiteHide

Approved
First Published:
1984
4.FM.15

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
M : Hydroxides with H2O +- (OH); unclassified
8.6.1.1

8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
6 : (AB)6O11·nH2O
18.1.4

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

Pronounciation of FranconiteHide

Pronounciation:
PlayRecorded byFrom
Jolyon & Katya RalphUnited Kingdom

Physical Properties of FranconiteHide

Vitreous
Colour:
White
Streak:
White
Hardness:
Cleavage:
None Observed
Density:
2.72(1) g/cm3 (Measured)    2.71 g/cm3 (Calculated)

Optical Data of FranconiteHide

Type:
Biaxial (-)
RI values:
nα = 1.720 nβ = 1.780 nγ = 1.790
Max Birefringence:
δ = 0.070
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
r < v moderate

Chemical Properties of FranconiteHide

Formula:
Na(Nb2O5)(OH) · 3H2O
IMA Formula:
NaNb2O5(OH) · 3H2O

Crystallography of FranconiteHide

Crystal System:
Monoclinic
Cell Parameters:
a = 22.21 Å, b = 12.87 Å, c = 6.35 Å
β = 92.24°
Ratio:
a:b:c = 1.726 : 1 : 0.493
Unit Cell V:
1,813.71 ų (Calculated from Unit Cell)

Type Occurrence of FranconiteHide

Place of Conservation of Type Material:
Geological Survey of Canada, Ottawa, 62094, 63748–63750.
Royal Ontario Museum, Toronto, Canada, M39041.
Associated Minerals at Type Locality:

Synonyms of FranconiteHide

Other Language Names for FranconiteHide

German:Franconit
Spanish:Franconita

Relationship of Franconite to other SpeciesHide

Other Members of this group:
Hochelagaite(Ca,Na,Sr)(Nb,Ti,Si,Al)4O11 · 8H2OMon.
Ternovite(Mg,Ca)Nb4O11 · nH2OMon.

Common AssociatesHide

Associated Minerals Based on Photo Data:
Aegirine25 photos of Franconite associated with Aegirine on mindat.org.
Thomasclarkite-(Y)13 photos of Franconite associated with Thomasclarkite-(Y) on mindat.org.
Albite12 photos of Franconite associated with Albite on mindat.org.
Siderite11 photos of Franconite associated with Siderite on mindat.org.
Niobokupletskite8 photos of Franconite associated with Niobokupletskite on mindat.org.
Niveolanite7 photos of Franconite associated with Niveolanite on mindat.org.
Rhodochrosite7 photos of Franconite associated with Rhodochrosite on mindat.org.
Microcline4 photos of Franconite associated with Microcline on mindat.org.
Catapleiite2 photos of Franconite associated with Catapleiite on mindat.org.
Adamsite-(Y)2 photos of Franconite associated with Adamsite-(Y) on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

4.FM.15Hochelagaite(Ca,Na,Sr)(Nb,Ti,Si,Al)4O11 · 8H2OMon.
4.FM.15Ternovite(Mg,Ca)Nb4O11 · nH2OMon.
4.FM.25BelyankiniteCa1-2(Ti,Nb)5O12 · 9H2O (?)Amor.
4.FM.25Gerasimovskite(Mn,Ca)(Nb,Ti)5O12 · 9H2O
4.FM.25Manganbelyankinite(Mn,Ca)(Ti,Nb)5O12 · 9H2O
4.FM.30Silhydrite3SiO2 · H2OOrth.
4.FM.35CuzticiteFe3+2(TeO6) · 3H2OHex.

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

8.6.1.2Hochelagaite(Ca,Na,Sr)(Nb,Ti,Si,Al)4O11 · 8H2OMon.

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.
18.1.5NatrotantiteNa2Ta4O11Mon.
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)
18.1.23FoorditeSn2+(Nb,Ta)2O6Mon. 2/m : B2/b
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
18.1.29Natrobistantite
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

Fluorescence of FranconiteHide

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 FranconiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Jambor, J.L., Sabina, A.P., Roberts, A.C., Bonardi, M., Ramik, R.A., Sturman, B.D. (1984) Franconite, a new hydrated Na-Nb oxide mineral from Montreal Island, Quebec. The Canadian Mineralogist: 22: 239-243.
Dunn, P.J., Gobel, V., Grice, J.D., Puziewicz, J., Shigley, J.E., Vanko, D.A., Zilczer, J. (1985) New mineral names. American Mineralogist: 70: 436-441.
Tarassoff, P., Horváth, L., Pfenninger-Horváth, E. (2006) Famous mineral localities: the Francon quarry, Montréal, Québec. Mineralogical Record: 37: 5-60.
Haring, M.M., McDonald, A.M. (2014) Franconite, NaNb2O5(OH)•3H2O: structure determination and the role of H-bonding, with comments on the crystal chemistry of franconite-related minerals. Mineralogical Magazine: 78: 591-607.

Internet Links for FranconiteHide

Localities for FranconiteHide

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.
Canada
 
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu RCM
        • Mont Saint-Hilaire
Horváth, L. & Gault, R.A. (1990), The mineralogy of Mont Saint-Hilaire Quebec. Mineralogical Record, 21, 284-359.
      • Lajemmerais RCM
        • Varennes & St-Amable
HORVÁTH, L., PFENNINGER HORVÁTH, E., GAULT, R.A., and TARASSOFF, P. (1998) Mineralogy of the Saint Amable sill, Varennes and Saint Amable, Québec, Canada. Mineralogical Record, 29, 83 118.
Horváth, L., Pfenninger-Horváth, E., Gault, R. A., & Tarassoff, P. (1998): Mineralogy of the Saint-Amable Sill, Varennes and Saint-Amable, Québec. Mineralogical Record, 29: 83-118.
    • Montréal
JAMBOR, J.L., SABINA, A.P., ROBERTS, A.C., BONARDI, M., RAMIK, R.A., and STURMAN,B.D. (1984) Franconite, a new hydrated Na Nb oxide mineral from Montreal Island, Quebec. Canadian Mineralogist, 22, 239-243. TARASSOFF, P., HORVÁTH, L. and PFENNINGER-HORVÁTH, E. (2006) Famous mineral localities: the Francon quarry, Montréal, Québec. Mineralogical Record, 37, 5-60.
Russia
 
  • Northern Region
    • Murmanskaja Oblast'
      • Kola Peninsula
        • Khibiny Massif
Pekov, I.V. & Podlesnyi, A.S. (2004): Kukisvumchorr Deposit: Mineralogy of Alkaline Pegmatites and Hydrotermalites. Mineralogical Almanac, vol. 7, 140 pages + xxiv photo's pages
      • Northern Karelia
New Data on Minerals (2004): 39: 50-64
  • Urals Region
    • Southern Urals
      • Chelyabinsk Oblast'
New Data on Minerals (2004): 39: 50-64
Mineral and/or Locality  
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