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Francisite Mineral Data
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General Francisite Information
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 Chemical Formula: |
Cu3Bi(SeO3)2O2Cl |
| Composition: |
Molecular Weight = 720.99 gm |
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Copper 26.44 % Cu 29.77 % Cu2O |
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Bismuth 28.99 % Bi 32.31 % Bi2O3 |
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Selenium 21.90 % Se 30.78 % SeO2 |
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Chlorine 4.92 % Cl 4.92 % Cl |
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- %
Cl -1.11 % -O=Cl2 |
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Oxygen 17.75 % O |
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______ ______ |
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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. |
| Name Pronunciation: |
Francisite + Pronunciation  |
| Synonym: |
ICSD 69385 |
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IMA1989-028 |
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PDF 46-1352 |
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Francisite Image |
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Images:
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Images:
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Francisite
Comments: Fine acicular crystals of green francisite to 0.1mm on matrix.
Location: Iron Monarch iron mine, Iron Knob, South Australia, Australia.
Scale: Picture size 1.5 cm.
© Tom Loomis / Dakota Matrix |
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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 - Dipyramidal H-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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Physical Properties of Francisite
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| Cleavage: |
None |
| Color: |
Light green. |
| Diaphaneity: |
Transparent |
| Hardness: |
3-4 - Calcite-Fluorite |
| Luster: |
Adamantine |
| Streak: |
light green |
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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: |
Bulk Density (Electron Density)=4.80 gm/cc
note: Specific Gravity of Francisite =5.42 gm/cc.
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| Fermion Index: |
Fermion Index = 0.01
Boson Index = 0.99 |
| Photoelectric: |
PEFrancisite = 557.48 barns/electron
U=PEFrancisite x rElectron Density=2,673.78 barns/cc.
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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: |
34.06.06.01 (34)Selenites - Tellurites - Sulfites |
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(34.06)Dana Type |
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(34.06.06)Dana Group |
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34.06.06.01 Francisite Cu3Bi(SeO3)2O2Cl Pmmn 2/m 2/m 2/m |
| Strunz Class: |
04.JG.25 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate |
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04.J - Arsenites, Antimonites, Bismuthites, Sulfites, |
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04.JG -Selenites with additional anions, without H2O |
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04.JG.25 Francisite Cu3Bi(SeO3)2O2Cl Pmmn 2/m 2/m 2/m |
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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 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST
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Print or Cut-and-Paste your Francisite Specimen Label here :
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Francisite
Cu3Bi(SeO3)2O2Cl
Dana No: 34.06.06.01 Strunz No: 04.JG.25
Locality:
Notes:
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