Francisite Mineral Data

(Translated by https://www.hiragana.jp/)
Francisite Mineral Data

General Francisite Information

Chemical Formula:

Cu3Bi(SeO3)2O2Cl

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

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

IMA1989-028

PDF 46-1352

Francisite Image

Images:

Francisite

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

Images:

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

Francisite Crystallography

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 - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pmmn

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.39(1), 2.866(0.8), 2.652(0.7),

Crystal Structure:

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Pring A , Gatehouse B M , Birch W D , American Mineralogist , 75 (1990) p.1421-1425, Francisite, Cu3Bi(SeO3)2O2Cl, a new mineral from Iron Monarch, South Australia:, Description and crystal structure

Physical Properties of Francisite

Cleavage:

None

Color:

Light green.

Diaphaneity:

Transparent

Hardness:

3-4 - Calcite-Fluorite

Luster:

Adamantine

Streak:

light green

Optical Properties of Francisite

Optical Data:

NCalc= 2.06 - from Gladstone-Dale relationship (KC = 0.1947) where Ncalc=Dcalc*KC+1

Calculated Properties of Francisite

Electron Density:

Bulk Density (Electron Density)=4.80 gm/cc
note: Specific Gravity of Francisite =5.42 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Francisite= 557.48 barns/electron
U=PE_Francisite x rElectron Density=2,673.78 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Francisite is Not Radioactive

Francisite Classification

Dana Class:

34.06.06.01 (34)Selenites - Tellurites - Sulfites

(34.06)Dana Type

(34.06.06)Dana Group

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

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

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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Ask about Francisite here :
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Print or Cut-and-Paste your Francisite Specimen Label here :

Francisite

Cu3Bi(SeO3)2O2Cl
Dana No: 34.06.06.01 Strunz No: 04.JG.25
Locality:

Notes: