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Franconite

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Formula:
NaNb2O5(OH) · 3H2O
System:
Monoclinic
Colour:
White
Lustre:
Vitreous
Hardness:
4
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.


Classification of Franconite

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

Physical Properties of Franconite

Vitreous
Colour:
White
Streak:
White
Hardness (Mohs):
4
Cleavage:
None Observed
Density:
2.72(1) g/cm3 (Measured)    2.71 g/cm3 (Calculated)

Optical Data of Franconite

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 Franconite

IMA Formula:
NaNb2O5(OH) · 3H2O
Elements listed in formula:

Crystallography of Franconite

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 Volume:
V 1,813.71 ų (Calculated from Unit Cell)

Type Occurrence of Franconite

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:

Relationship of Franconite to other Species

Other Members of Group:
Hochelagaite(Ca,Na,Sr)(Nb,Ti,Si,Al)4O11 · 8H2O
Ternovite(Mg,Ca)Nb4O11 · nH2O
4.FM.15HochelagaiteCaNb4O11 · 8H2O
4.FM.15TernoviteMgNb4O11 · 8-12H2O
4.FM.25BelyankiniteCa1-2(Ti,Zr,Nb)5O12 · 9H2O
4.FM.25GerasimovskiteMn2+(Ti,Nb)5O12 · 9H2O
4.FM.25ManganbelyankiniteMn2+(Ti,Nb)5O12 · 9H2O
4.FM.30SilhydriteSi3O6 · H2O
4.FM.35CuzticiteFe23+Te6+O6 · 3H2O
18.1.1LithiotantiteLiTa3O8
18.1.2LueshiteNaNbO3
18.1.3NatroniobiteNaNbO3
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)
18.1.23FoorditeSn2+Nb2O6
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 Franconite

Name in Other Languages:
German:Franconit
Spanish:Franconita

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 Franconite

Reference List:
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 Franconite

mindat.org URL:
https://www.mindat.org/min-1595.html
Please feel free to link to this page.
Specimens:
The following Franconite specimens are currently listed for sale on minfind.com.

Localities for Franconite

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.
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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