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Francisite

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Baccu Locci Mine, Villaputzu, Cagliari Province, Sardinia, Italy
© Thomas Witzke

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Formula:
Cu
 
3
Bi(SeO
 
3
)
 
2
O
 
2
Cl
System:OrthorhombicColour:Bright green
Hardness:3 - 4
This page provides mineralogical data about Francisite.

Classification of Francisite

IMA status:Approved
Strunz 8th edition ID:4/K.10-50
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:34.6.6.1

34 : SELENITES, TELLURITES AND SULFITES
6 : Anhydrous Selenites, Tellurites and Sulfites containing Hydroxyl or Halogen
Hey's CIM Ref.:28.1.3

28 : Selenites, Selenates, Tellurites, and Tellurates
1 : Selenites
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Type Occurrence of Francisite

Type Locality:Iron Monarch open cut, Iron Knob, Middleback Range, Eyre peninsula, South Australia, Australia
Year of Discovery:1990

Physical Properties of Francisite

Colour:Bright green
Hardness (Mohs):3 - 4

Crystallography of Francisite

Crystal System:Orthorhombic
Cell Parameters:a = 6.35Å, b = 9.63Å, c = 7.22Å
Ratio:a:b:c = 0.659 : 1 : 0.75
Unit Cell Volume:V 441.51 ų (Calculated from Unit Cell)

Chemical Properties of Francisite

Formula:
Cu
 
3
Bi(SeO
 
3
)
 
2
O
 
2
Cl
Essential elements:Bi, Cl, Cu, O, Se
All elements listed in formula:Bi, Cl, Cu, O, Se

Relationship of Francisite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
4.JG.Prewittite
KPb
 
1.5
ZnCu
 
6
[O
 
2
|Cl
 
10
|(SeO
 
3
)
 
2
]
4.JG.05Georgbokiite
Cu
 
5
[O
 
2
|Cl
 
2
|(SeO
 
3
)
 
2
]
4.JG.05Parageorgbokiite
Cu
 
5
[O
 
2
|Cl
 
2
|(SeO
 
3
)
 
2
]
4.JG.10Chloromenite
Cu
 
9
[O
 
2
|Cl
 
6
|(SeO
 
3
)
 
4
]
4.JG.15Sophiite
Zn
 
2
[Cl
 
2
|SeO
 
3
]
4.JG.20Ilinskite
(Na,K)Cu
 
5
[O
 
2
|Cl
 
3
|(SeO
 
3
)
 
2
]
4.JG.30Derriksite
Cu
 
4
UO
 
2
(SeO
 
3
)
 
2
(OH)
 
6
·H
 
2
O
4.JG.35Burnsite
KCdCu
2+
7
[O
 
2
|Cl
 
9
|(SeO
 
3
)
 
2
]
4.JG.40Allochalcoselite
Cu
+
 
PbCu
2+
5
[O
 
2
|Cl
 
5
|(SeO
 
3
)
 
2
]
Related Minerals - Hey's Index Grouping:

- +
28.1.1Chalcomenite
Cu[SeO
 
3
] · 2H
 
2
O
28.1.2Clinochalcomenite
Cu[SeO
 
3
] · 2H
 
2
O
28.1.4Sophiite
Zn
 
2
[Cl
 
2
|SeO
 
3
]
28.1.5Molybdomenite
PbSeO
 
3
28.1.6Haynesite
(UO
 
2
)
 
3
(OH)
 
2
(SeO
 
3
)
 
2
·5H
 
2
O
28.1.7Derriksite
Cu
 
4
UO
 
2
(SeO
 
3
)
 
2
(OH)
 
6
·H
 
2
O
28.1.8Marthozite
Cu(UO
 
2
)
 
3
(SeO
 
3
)
 
3
(OH)
 
2
·7H
 
2
O
28.1.9Guilleminite
Ba(UO
 
2
)
 
3
(SeO
 
3
)
 
2
(OH)
 
4
·3H
 
2
O
28.1.10Demesmaekerite
Pb
 
2
Cu
 
5
(UO
 
2
)
 
2
(SeO
 
3
)
 
6
(OH)
 
6
·2H
 
2
O
28.1.11Mandarinoite
Fe
 
2
Se
 
3
O
 
9
·4H
 
2
O
28.1.12Cobaltomenite
Co[SeO
 
3
] · 2H
 
2
O
28.1.13Ahlfeldite
(Ni,Co)[SeO
 
3
] · 2H
 
2
O

Other Names for Francisite

Synonyms:
IMA1989-028
Other Languages:
German:Francisit
Russian:Франсисит
Spanish:Francisita

Other Information

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

References for Francisite

Reference List:American Mineralogist: 75: 1421-1425.

Articles/Blogs about Francisite

Internet Links for Francisite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Francisite in the Natural History Museum (London) online catalogue
  • Francisite details from Handbook of Mineralogy (PDF)
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    Localities for Francisite

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    The 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.
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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Australia
     
    • 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.
    Italy
     
    • Sardinia
      • Cagliari Province
        • 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.
    Mineral and/or Locality
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