Where it forms, where it's found
- Geological setting
Barite lens in hematite ore. Hydrothermal alteration of the selenide and sulfide minerals
- Type locality
- Iron Monarch Main Pit
- Iron Knob
- Pastoral Unincorporated Area
- South Australia
- Australia
-32.7447°, 137.1395°
2recorded occurrences
Safety & handling
Physical
Optical
- Pleochroism
- Visible
pale green to bright green
- Notes
mineral reacts with high RI liquids. RI > 1.79
Crystallography
- Space group
- Pmmn
- Cell parameters
- a = 6.356(1) Å · b = 9.633(2) Å · c = 7.224(2) Å
- Ratio a:b:c
- 1 : 1.516 : 1.137
- Z
- 2
- Twinning
Contact twinning on (100)
- Type-locality form
Bladed crystals
Crystal structure
Chemical composition
Synonyms
- Francisiet
- IMA1989-028
In other languages
- German
- Francisit · IMA 1989-028
- Spanish
- Francisita
- Italian
- Francisite
Classification
Strunz
10th ed.4.JG.25
- 4OxidesClass
- 4.JArsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodatesDivision
- 4.JGSelenites with additional anions, without H2OGroup
- 4.JG.25FrancisiteSpecies
Dana
8th ed.34.06.06.01
- 34Selenites, Tellurites and SulfitesClass
- 34.06Anhydrous Selenites, Tellurites and Sulfites containing Hydroxyl or HalogenType
- 34.06.06— unnamed intermediate level —Group
- 34.06.06.01FrancisiteSpecies
CIM
—28.1.3
- 28Selenites, Selenates, Tellurites, and TelluratesClass
- 28.1SelenitesGroup
- 28.1.3FrancisiteSpecies
Literature, links & citation
Citations
- 1990Pring, Allan, Birch, Bryan M. Gatehouse William D. (1990) Francisite, Cu3Bi(SeO3)2O2Cl, a new mineral from Iron Monarch, South Australia: Description and crystal structure. American Mineralogist, 75 (11-12) 1421-1425
- 2005(2005) Francisite. Handbook of Mineralogy. Mineralogical Society of America
- 2016Gnezdilov, 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).
Cite this entry
@misc{mineral2026,
author = {Mineral Index editorial board},
title = {Francisite — Mineral Index},
year = {2026},
url = {https://mineralindex.org/minerals/francisite-1591},
note = {Accessed 2026-05-11}
}