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Francisite Mineral Data

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General Francisite Information

Help on Chemical  Formula: Chemical Formula: Cu3Bi(SeO3)2O2Cl
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Cu3Bi(SeO3)2O2Cl
Help on Environment: Environment: Rare secondary mineral in an oxidized barite lens in Precambrian sedimenary iron formation.
Help on IMA Status: IMA Status: Approved IMA 1990
Help on Locality: Locality: Iron Monarch quarry, Iron Knob, South Australia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Glyn Francis (1939-), Quality Control Officer at the Iron Monarch quarry, Australia who collected the mineral.
Help on Name Pronunciation: Name Pronunciation: Francisite + Pronunciation Say FRANCISITE
Help on Synonym: Synonym: ICSD 69385
  PDF 46-1352

Francisite Image

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Comments: Greenish crusts of francisite on matrix.
Location: Baccu Locci Mine, Villaputzu, Cagliari Province, Sardinia, Italy. Scale: Picture size 3.5 mm.
© Thomas Witzke / Abraxas-Verlag

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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

Francisite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.6598:1:0.7497
Help on Cell Dimensions: Cell Dimensions: a = 6.354, b = 9.63, c = 7.22, Z = 2; V = 441.78 Den(Calc)= 5.42
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pmmn
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.39(1), 2.866(0.8), 2.652(0.7),

Physical Properties of Francisite

Help on Cleavage: Cleavage: None
Help on Color: Color: Light green.
Help on Diaphaneity: Diaphaneity: Transparent
Help on Hardness: Hardness: 3-4 - Calcite-Fluorite
Help on Luster: Luster: Adamantine
Help on Streak: Streak: light green

Optical Properties of Francisite

Help on Optical Data: Optical Data: NCalc= 2.06 - from Gladstone-Dale relationship (KC = 0.1947) where Ncalc=Dcalc*KC+1

Calculated Properties of Francisite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.80 gm/cc
note: Specific Gravity of Francisite =5.42 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEFrancisite = 557.48 barns/electron
U=PEFrancisite x rElectron Density=2,673.78 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Francisite is Not Radioactive

Francisite Classification

Help on  Dana Class: Dana Class: (34)Selenites - Tellurites - Sulfites
  (34.06)Dana Type
  (34.06.06)Dana Group Francisite Cu3Bi(SeO3)2O2Cl Pmmn 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 04.JG.25 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.J - Arsenites, Antimonites, Bismuthites, Sulfites,
  04.JG -Selenites with additional anions, without H2O
04.JG.25 Francisite Cu3Bi(SeO3)2O2Cl Pmmn 2/m 2/m 2/m

Other Francisite Information

Help on References: References: NAME( AntBidBlaNic5) PHYS. PROP.(Am.Min.,Vol.75,p1421-1425,1990)
Help on See Also: 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

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Dana No: Strunz No: 04.JG.25





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