Franconite Mineral Data

General Franconite Information

Chemical Formula: Na2Nb4O11•9(H2O) 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 Empirical Formula: Na₂Nb₄O₁₁•9(H₂O) Environment: In a dawsonite-bearing sill in vugs. IMA Status: Approved IMA 1984 Locality: Francon Quarry, Montreal Island, Quebec, Canada. Link to MinDat.org Location Data. Name Origin: Named for the locality. Name Pronunciation: Franconite + Pronunciation Synonym: IMA1981-006  

Franconite Image

Images:

Franconite 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

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

Physical Properties of Franconite

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

Optical Properties of Franconite

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 Optical Data: Biaxial (-), a=1.72, b=1.78, g=1.79, bire=0.0700 Pleochroism (x): colorless. Pleochroism (y): colorless. Pleochroism (z): colorless.  

Calculated Properties of Franconite

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

Franconite Classification

Dana Class: 08.06.01.01 (08)Multiple Oxides with Nb, Ta, and Ti   (08.06)Dana Type   (08.06.01)Franconite Group  

08.06.01.01 Franconite Na2Nb4O11•9(H2O) Unk Mono

 

08.06.01.02 Hochelagaite (Ca,Na,Sr)Nb4O11•8(H2O) Unk Mono

 

08.06.01.03 Ternovite! (Mg,Ca)Nb4O11-n(H2O)wheren~10 P 2/m,P 2,Pm Mono

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

References: NAME( Dana8) PHYS. PROP.(www.saint-hilaire.ca) OPTIC PROP.(Dana8) 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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Ask about Franconite here :
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