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Francisite

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About FrancisiteHide

02171570015152021052436.jpg
Glyn Francis
Formula:
Cu3Bi(SeO3)2O2Cl
Colour:
Bright green
Lustre:
Adamantine
Hardness:
3 - 4
Specific Gravity:
5.42 (Calculated)
Crystal System:
Orthorhombic
Name:
Named in recognition of Glyn Francis's (b. 1939) contribution to the understanding and preservation of the minerals of the Iron Monarch ore body. Glyn was Quality Control Officer at Iron Monarch and produced a book on the deposit in 2010.
This page provides mineralogical data about Francisite.


Classification of FrancisiteHide

Approved
First Published:
1990
4.JG.25

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
G : Selenites with additional anions, without H2O
34.6.6.1

34 : SELENITES, TELLURITES AND SULFITES
6 : Anhydrous Selenites, Tellurites and Sulfites containing Hydroxyl or Halogen
28.1.3

28 : Selenites, Selenates, Tellurites, and Tellurates
1 : Selenites

Physical Properties of FrancisiteHide

Adamantine
Colour:
Bright green
Streak:
pale apple green
Hardness:
3 - 4 on Mohs scale
Comment:
estimated
Cleavage:
None Observed
Fracture:
Conchoidal
Density:
5.42 g/cm3 (Calculated)

Chemical Properties of FrancisiteHide

Formula:
Cu3Bi(SeO3)2O2Cl
IMA Formula:
Cu3Bi(Se4+O3)2O2Cl

Crystallography of FrancisiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pmmn
Setting:
Pmmn
Cell Parameters:
a = 6.356(1) Å, b = 9.633(2) Å, c = 7.224(2) Å
Ratio:
a:b:c = 0.66 : 1 : 0.75
Unit Cell V:
442.31 ų (Calculated from Unit Cell)
Z:
2
Twinning:
Contact twinning on {100}

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
5.31 Å(60)
3.39 Å(100)
2.866 Å(80)
2.652 Å(70)
2.491 Å(60)
1.695 Å(35)
1.588 Å(60)

Type Occurrence of FrancisiteHide

General Appearance of Type Material:
Bladed crystals
Place of Conservation of Type Material:
South Australian Museum, Adelaide, and the Museum of Victoria, Melbourne.
Geological Setting of Type Material:
Barite lens in hematite ore. Hydrothermal alteration of the selenide and sulfide minerals
Associated Minerals at Type Locality:
Reference:
Pring, A., Gatehouse, B.M., Birch, W.D. (1990) Francisite, Cu3Bi(SeO3)2O2Cl, new mineral from Iron Monarch, South Australia: description and crystal structure. American Mineralogist: 75: 1421-1425.

Synonyms of FrancisiteHide

Other Language Names for FrancisiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
1 photo of Francisite associated with ChalcomeniteCuSeO3 · 2H2O

Related Minerals - Nickel-Strunz GroupingHide

4.JG.PrewittiteKPb1.5ZnCu6(SeO3)2O2Cl10Orth. mmm (2/m 2/m 2/m) : Pnnm
4.JG.05GeorgbokiiteCu5(SeO3)2O2Cl2Mon.
4.JG.05ParageorgbokiiteCu5(SeO3)2O2Cl2Mon. 2/m : P21/b
4.JG.10ChloromeniteCu9(SeO3)4O2Cl6Mon.
4.JG.15SofiiteZn2(SeO3)Cl2Orth.
4.JG.20Ilinskite(Na,K)Cu5(SeO3)2O2Cl3Orth. mmm (2/m 2/m 2/m) : Pnma
4.JG.30DerriksiteCu4(UO2)(SeO3)2(OH)6Orth.
4.JG.35BurnsiteKCdCu2+7(SeO3)2O2Cl9Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
4.JG.40AllochalcoseliteCu+PbCu2+5(SeO3)2Cl5O2Mon. 2/m : B2/m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

28.1.1ChalcomeniteCuSeO3 · 2H2OOrth. 2 2 2 : P21 21 21
28.1.2ClinochalcomeniteCuSeO3 · 2H2OMon.
28.1.4SofiiteZn2(SeO3)Cl2Orth.
28.1.5MolybdomenitePbSeO3Mon.
28.1.6Haynesite(UO2)3(OH)2(SeO3)2 · 5H2OOrth.
28.1.7DerriksiteCu4(UO2)(SeO3)2(OH)6Orth.
28.1.8MarthoziteCu2+(UO2)3(SeO3)2O2 · 8H2OOrth.
28.1.9GuilleminiteBa(UO2)3(SeO3)2O2 · 3H2OOrth. mm2 : Pmn21
28.1.10DemesmaekeritePb2Cu5(UO2)2(SeO3)6(OH)6 · 2H2OTric.
28.1.11MandarinoiteFe3+2(Se4+O3)3 · (6-x)H2O (x = 0.0-1.0)Mon. 2/m : P21/b
28.1.12CobaltomeniteCoSeO3 · 2H2OMon.
28.1.13AhlfelditeNi(SeO3) · 2H2OMon. 2/m

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for FrancisiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Pring, A., Gatehouse, B.M., Birch, W.D. (1990) Francisite, Cu3Bi(SeO3)2O2Cl, new mineral from Iron Monarch, South Australia: description and crystal structure. American Mineralogist: 75: 1421-1425.
Gnezdilov, V., Pashkevich, Yu., Lemmens, P., Vasiliev, A., Berdonosov, P. (2016) Structural and magnetic instabilities of the pseudo-Kagome francisites Cu3Bi(SeO3)2O2X with X=Br,Cl. Preprint (2016).

Internet Links for FrancisiteHide

Localities for FrancisiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Australia (TL)
 
  • South Australia
    • Eyre Peninsula
      • Middleback Range
        • Iron Knob
Amer.Min.(1990) 75, 1421-1425; Pring, A., Francis, G. & Birch, W. D. (1992): Nissonite, namibite, and other additions to the mineral suite from Iron Monarch, South Australia. Australian Mineral. 6, 31-39. ; Pring A, Gatehouse B M, Birch W D (1990) Francisite, Cu3Bi(SeO3)2O2Cl, new mineral from Iron Monarch, South Australia: description and crystal structure. American Mineralogist 75, 1421-1425
Italy
 
  • Sardinia
    • South Sardinia Province
      • Sarrabus-Gerrei
        • Gerrei
          • Villaputzu
Campostrini, I. & Gramaccioli, C. M. (2001): Selenium-rich secondary minerals from the Baccu Locci mine (Sardinia, Italy). Neues Jahrbuch fuer Mineralogie, Abhandlungen 177, 37-59; http://www.mindat.org/mesg-9-391506.html; Campostrini, I., Gramaccioli, C. M. and Demartin, F. (1999): Orlandiite, Pb3Cl4(SeO3)3•H2O, a new mineral species, and an associated lead-copper selenite chloride from the Baccu Locci mine, Sardinia, Italy. Can. Mineral. 37, 1493-1498
 
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