Francisite Mineral Data + 
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- 34.6.6.1 Francisite Cu3Bi(SeO3)2O2Cl Pmmn 2/m 2/m 2/m
- IV/K.10-10 Keystoneite Mg0.5[NiFe(TeO3)3]·4.5(H2O) P 63/m 6/m
- IV/K.10-20 Kinichilite Mg0.5[MnFe(TeO3)3]·4.5(H2O) P 63/m 6/m
- IV/K.10-30 Zemannite Mg0.5[ZnFe(TeO3)3]·4.5(H2O) P 63/m 6/m
- IV/K.10-40 Quetzalcoatlite Zn8Cu4(TeO3)3(OH)18 C6322 6 2 2
- IV/K.10-50 Francisite Cu3Bi(SeO3)2O2Cl Pmmn 2/m 2/m 2/m
General Francisite Information |
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 Chemical Formula: |
Cu3Bi(SeO3)2O2Cl | ||
| Composition: |
Molecular Weight = 720.99 gm | ||
| Copper 26.44 % Cu 29.77 % Cu2O | |||
| Bismuth 28.99 % Bi 32.31 % Bi2O3 | |||
| Selenium 21.90 % Se 30.78 % SeO2 | |||
| Chlorine 4.92 % Cl 4.92 % Cl | |||
| - % Cl -1.11 % -O=Cl2 | |||
| Oxygen 17.75 % O | |||
| ______ ______ | |||
| 100.00 % 96.67 % = TOTAL OXIDE | |||
| Empirical Formula: |
Cu3Bi(SeO3)2O2Cl | ||
| Environment: |
Rare secondary mineral in an oxidized barite lens in Precambrian sedimenary iron formation. | ||
| IMA Status: |
Approved IMA 1990 | ||
| Locality: |
Iron Monarch quarry, Iron Knob, South Australia. Link to MinDat.org Location Data. | ||
| Name Origin: |
Named for Glyn Francis (1939-), Quality Control Officer at the Iron Monarch quarry, Australia who collected the mineral. | ||
| Synonym: |
ICSD 69385 | ||
| IMA1989-028 | |||
| PDF 46-1352 | |||
Francisite Image | |||
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Images:
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Images:
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Francisite Crystallography |
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| Axial Ratios: |
a:b:c =0.6598:1:0.7497 | ||
| Cell Dimensions: |
a = 6.354, b = 9.63, c = 7.22, Z = 2; V = 441.78 Den(Calc)= 5.42 | ||
| Crystal System: |
Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pmmn | ||
| X Ray Diffraction: |
By Intensity(I/Io): 3.39(1), 2.866(0.8), 2.652(0.7), | ||
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Crystal Structure:
Mouse |
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Physical Properties of Francisite |
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| Cleavage: |
None | ||
| Color: |
Light green. | ||
| Diaphaniety: |
Transparent | ||
| Hardness: |
3-4 - Calcite-Fluorite | ||
| Luster: |
Adamantine | ||
| Streak: |
light green | ||
Optical Properties of Francisite |
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| Optical Data: |
NCalc= 2.06 - from Gladstone-Dale relationship (KC = 0.1947) where Ncalc=Dcalc*KC+1 |
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Calculated Properties of Francisite |
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| Electron Density: |
relectron=4.80 gm/cc |
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| Fermion Index |
Fermion Index = 0.01673 Boson Index = 0.98327 |
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| Photoelectric: |
PEFrancisite = 557.48 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Francisite is Not Radioactive |
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Francisite Classification |
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| Dana Class: |
34.6.6.1 (34)Selenites - Tellurites - Sulfites | ||
| (34.6)Dana Type | |||
| (34.6.6)Dana Group | |||
| Strunz Class: |
IV/K.10-50 IV - Oxides | ||
| IV/K - Sulfides, selenides, tellurides with [XO3]2- groups and related structures | |||
| IV/K.10 - Keystoneite - Francisite series | |||
Other Francisite Information |
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| References: |
NAME( AntBidBlaNic5) PHYS. PROP.(Am.Min.,Vol.75,p1421-1425,1990) | ||
| See Also: |
Links to other databases for Francisite : 1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris Search for Francisite using: Visit our Advertisers for Francisite : Translate Francisite Mineral Data : Ask about Francisite here : Print or Cut-and-Paste your Francisite Specimen Label here :
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