Franconite Mineral Data + 
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- 8.6.1.1 Franconite Na2Nb4O11·9(H2O) Unk Mono
- 8.6.1.2 Hochelagaite (Ca,Na,Sr)Nb4O11·8(H2O) Unk Mono
- 8.6.1.3 Ternovite! (Mg,Ca)Nb4O11-n(H2O)wheren~10 P 2/m,P 2,Pm Mono
- IV/D.06-10 Belyankinite Ca1-2(Ti,Zr,Nb)5O12·9(H2O)(?) None
- IV/D.06-20 Manganbelyankinite (Mn,Ca)(Ti,Nb)5O12·9(H2O) None
- IV/D.06-30 Gerasimovskite (Mn,Ca)(Nb,Ti)5O12·9(H2O)(?) None
- IV/D.06-35 Ternovite! (Mg,Ca)Nb4O11-n(H2O)wheren~10 P 2/m,P 2,Pm Mono
- IV/D.06-40 Franconite Na2Nb4O11·9(H2O) Unk Mono
- IV/D.06-50 Hochelagaite (Ca,Na,Sr)Nb4O11·8(H2O) Unk Mono
General Franconite Information |
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 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. | ||
| Synonym: |
IMA1981-006 | ||
Search for Franconite Images | |||
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Images:
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Franconite Crystallography |
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| 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/Io): 11(1), 5.55(0.7), 4.73(0.6), | ||
Physical Properties of Franconite |
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| Cleavage: |
[001] Parting | ||
| Color: |
White. | ||
| Density: |
2.72 | ||
| Diaphaniety: |
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: |
Non-fluorescent. | ||
| Luster: |
Vitreous - Silky | ||
| Streak: |
white | ||
Optical Properties of Franconite |
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| 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= 0.277 |
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| 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 |
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| Electron Density: |
relectron=2.66 gm/cc |
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| Fermion Index |
Fermion Index = 0.0002 Boson Index = 0.9998 |
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| Photoelectric: |
PEFranconite = 72.34 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Franconite is Not Radioactive |
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Franconite Classification |
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| Dana Class: |
8.6.1.1 (8)Multiple Oxides with Nb, Ta, and Ti | ||
| (8.6)Dana Type | |||
| (8.6.1)Dana Group | |||
| Strunz Class: |
IV/D.06-40 IV - Oxides | ||
| IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds) | |||
| IV/D.06 - Belyankinite - Hochelagaite series | |||
Other Franconite Information |
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| References: |
NAME( Dana8) PHYS. PROP.(Dana8) 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 -Google Images 7 -Google Scholar 8 -Handbook of Mineralogy (UofA) 9 -MinDAT 10 -MinMax(Deutsch) 11 -MinMax(English) 12 -Mineralienatlas (Deutsch) 13 -QUT Mineral Atlas 14 -École des Mines de Paris Search for Franconite using: Visit our Advertisers for Franconite : Translate Franconite Mineral Data : Ask about Franconite here : Print or Cut-and-Paste your Franconite Specimen Label here :
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