Mineralogy Database

Franconite Mineral Data

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General Franconite Information

Help on Chemical  Formula: Chemical Formula: Na2Nb4O11•9(H2O)
Help on Composition: Composition: Molecular Weight = 755.74 gm
   Sodium     6.08 %  Na    8.20 % Na2O
   Niobium   49.17 %  Nb   70.34 % Nb2O5
   Hydrogen   2.40 %  H    21.45 % H2O
   Oxygen    42.34 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na2Nb4O11•9(H2O)
Help on Environment: Environment: In a dawsonite-bearing sill in vugs.
Help on IMA Status: IMA Status: Approved IMA 1984
Help on Locality: Locality: Francon Quarry, Montreal Island, Quebec, Canada. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Franconite + Pronunciation Say FRANCONITE
Help on Synonym: Synonym: IMA1981-006

Franconite Image

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Comments: Irregular to ball-shaped aggregates of silky white franconite on white albite.
Location: Mont St. Hilaire, Quebec, Canada. Scale: Specimen Size 2.5 x 4 cm.
© Diederik Visser

Franconite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.7278:1:0.4945
Help on Cell Dimensions: Cell Dimensions: a = 22.22, b = 12.86, c = 6.36, Z = 4; beta = 92.23° V = 1,815.99 Den(Calc)= 2.76
Help on Crystal System: Crystal System: Monoclinic Space Group: Unk
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 11(1), 5.55(0.7), 4.73(0.6),

Physical Properties of Franconite

Help on Cleavage: Cleavage: {001} Parting
Help on Color: Color: White.
Help on Density: Density: 2.72
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).
Help on Hardness: Hardness: 4 - Fluorite
Help on Luminescence: Luminescence: Fluorescent, Short UV=yellow white, Long UV=yellow white.
Help on Luster: Luster: Vitreous - Silky
Help on Streak: Streak: white

Optical Properties of Franconite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.013 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.002 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2766,KPDmeas= 0.2806,KC= 0.2771
Ncalc = 1.75 - 1.76
Help on Optical Data: Optical Data: Biaxial (-), a=1.72, b=1.78, g=1.79, bire=0.0700
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): colorless.
Help on Pleochroism (z): Pleochroism (z): colorless.

Calculated Properties of Franconite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.66 gm/cc
note: Specific Gravity of Franconite =2.76 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.000206839
Boson Index = 0.999793161
Help on Photoelectric: Photoelectric: PEFranconite = 72.34 barns/electron
U=PEFranconite x rElectron Density= 192.34 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Franconite is Not Radioactive

Franconite Classification

Help on  Dana Class: Dana Class: (08)Multiple Oxides with Nb, Ta, and Ti
  (08.06)Dana Type
  (08.06.01)Franconite Group Franconite Na2Nb4O11•9(H2O) Unk Mono Hochelagaite (Ca,Na,Sr)Nb4O11•8(H2O) Unk Mono Ternovite! (Mg,Ca)Nb4O11-n(H2O)wheren~10 P 2/m,P 2,Pm Mono
Help on  Strunz Class: Strunz Class: 04.FM.15 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.F - Hydroxides (without V or U)
  04.FM -Hydroxides with H2O � (OH); Unclassified
04.FM.15 Franconite Na2Nb4O11•9(H2O) Unk Mono
04.FM.15 Hochelagaite (Ca,Na,Sr)Nb4O11•8(H2O) Unk Mono
04.FM.15 Ternovite! (Mg,Ca)Nb4O11-n(H2O)wheren~10 P 2/m,P 2,Pm Mono

Other Franconite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(www.saint-hilaire.ca) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Franconite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - EUROmin Project
6 - Ecole des Mines de Paris
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info

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Dana No: Strunz No: 04.FM.15





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