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Guilleminite

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Musonoi Mine, Kolwezi, Katanga Copper Crescent, Katanga (Shaba), Democratic Republic of Congo (Zaïre)
© Stephan Wolfsried

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Formula:
Ba(UO
 
2
)
 
3
(SeO
 
3
)
 
2
(OH)
 
4
 · 3H
 
2
O
System:OrthorhombicColour:Bright yellow
Hardness:2
Name:Named by R. Pierrot, J. Toussaint, and T. Verbeek in 1965 in honor of Jean Claude Guillemin [September 13, 1923 France - April 6, 1994 France], chemist and mineralogist, 1957-1969 he was professor at the Ecole des Mines in Paris and curator of the mineral collection of the Ecole des Mines. Guillemin was director general of the Union Miniere du Haut-Katanga and co-founder of the International Mineralogical Association.
This page provides mineralogical data about Guilleminite.

Classification of Guilleminite

IMA status:Approved
Strunz 8th edition ID:4/K.11-30
Nickel-Strunz 10th (pending) edition ID:4.JJ.10

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
J : Selenites with additional anions, with H2O
Dana 8th edition ID:34.7.3.1

34 : SELENITES, TELLURITES AND SULFITES
7 : Hydrated Selenites, Tellurites and Sulfites containing Hydroxyl or Halogen
Hey's CIM Ref.:28.1.9

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

Type Locality:Musonoi Mine, Kolwezi, Katanga Copper Crescent, Katanga (Shaba), Democratic Republic of Congo (Zaïre)
General Appearance of Type Material:selenian digenite
malachite
derricksite
marthozite
Year of Discovery:1965
Geological Setting of type material:Oxidized zone of a Uranium-Selenium-Copper deposit

Physical Properties of Guilleminite

Lustre:Waxy, Greasy, Dull, Earthy
Diaphaneity (Transparency):Translucent
Colour:Bright yellow
Streak:Light yellow
Hardness (Mohs):2
Hardness Data:Estimated
Tenacity:Brittle
Cleavage:Perfect
{100} perfect, {010} good.
Density (measured):4.88 g/cm3
Density (calculated):5.08 g/cm3

Crystallography of Guilleminite

Crystal System:Orthorhombic
Class (H-M):mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:Pmna {P2/m 2/n 21/a}
Space Group Setting:Pmna
Cell Parameters:a = 7.29Å, b = 16.87Å, c = 7.07Å
Ratio:a:b:c = 0.432 : 1 : 0.419
Unit Cell Volume:V 869.48 ų (Calculated from Unit Cell)
Z:2
X-Ray Powder Diffraction:
d-spacingIntensity
8.39 (100)
7.29 (100)
6.68 (60)
6.51 (20)
3.55 (80)
3.17 (40)
3.04 (60)
2.80 (60)
Comments:ICDD 18-582

Optical Data of Guilleminite

Type:Biaxial (-)
RI values: nα = 1.720 nβ = 1.798 nγ = 1.805
2V:Measured: 35° , Calculated: 32°
Birefringence:0.085
Maximum Birefringence:δ = 0.085

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Dispersion:r > v strong
Pleochroism:Strong
Comments:X=bright yellow Y=yellow Z=colorless

Chemical Properties of Guilleminite

Formula:
Ba(UO
 
2
)
 
3
(SeO
 
3
)
 
2
(OH)
 
4
 · 3H
 
2
O
Essential elements:Ba, H, O, Se, U
All elements listed in formula:Ba, H, O, Se, U

Relationship of Guilleminite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
4.JJ.05Marthozite
Cu(UO
 
2
)
 
3
(SeO
 
3
)
 
3
(OH)
 
2
 · 7H
 
2
O
4.JJ.15Piretite
Ca(UO
 
2
)
 
3
(SeO
 
3
)
 
2
(OH)
 
4
 · 4H
 
2
O
4.JJ.20Demesmaekerite
Pb
 
2
Cu
 
5
(UO
 
2
)
 
2
(SeO
 
3
)
 
6
(OH)
 
6
 · 2H
 
2
O
4.JJ.25Haynesite
(UO
 
2
)
 
3
(OH)
 
2
(SeO
 
3
)
 
2
 · 5H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
28.1.1Chalcomenite
CuSeO
 
3
 · 2H
 
2
O
28.1.2Clinochalcomenite
CuSeO
 
3
 · 2H
 
2
O
28.1.3Francisite
Cu
 
3
Bi(SeO
 
3
)
 
2
O
 
2
Cl
28.1.4Sophiite
Zn
 
2
(SeO
 
3
)Cl
 
2
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
28.1.10Demesmaekerite
Pb
 
2
Cu
 
5
(UO
 
2
)
 
2
(SeO
 
3
)
 
6
(OH)
 
6
 · 2H
 
2
O
28.1.11Mandarinoite
Fe
3+
2
(SeO
 
3
)
 
3
 · 4H
 
2
O
28.1.12Cobaltomenite
CoSeO
 
3
 · 2H
 
2
O
28.1.13Ahlfeldite
(Ni,Co)SeO
 
3
 · 2H
 
2
O

Other Names for Guilleminite

Synonyms:
IMA1964-031
Other Languages:
German:Guilleminit
Russian:Гийменит
Spanish:Guilleminita

Other Information

Fluorescence in UV light:Not fluorescent.
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 Guilleminite

Reference List:

- +
Bulletin Mineralogie (1965): 88:132.

American Mineralogist (1965): 50: 2103.

Cooper, M.A. and Hawthorne, F.C. (1995) The crystal structure of guilleminite, a hydrated Ba-U-Se sheet structure. Canadian Mineralogist: 33: 1103-1109.

Cooper, M.A. and Hawthorne, F.C. (2001) Structure topology and hydrogen bonding in marthozite, Cu 2+[(UO2)3(SeO3)2O2](H2O)8, a comparison with guilleminite, Ba[(UO2)3(SeO3)2O2](H2O)3. Canadian Mineralogist: 39: 797-807.

Burns, P.C. (2005) U 6+ minerals and inorganic compounds: insights into an expanded structural hierarchy of crystal structures. Canadian Mineralogist: 43: 1839-1894.

Internet Links for Guilleminite

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    • Localities for Guilleminite

    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.
    Hide Locality List
    (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.
    Democratic Republic of Congo (Zaïre)
     
    • Katanga (Shaba)
      • Katanga Copper Crescent
        • Kolwezi
    		Bull.Soc.fr.Min.Crist.(1965) 88, 132-135
        • Shinkolobwe
    		M. Deliens
    France
     
    • Auvergne
      • Puy-de-Dôme
        • Saint-Amant-Tallende
          • Olloix
    		Le Règne Minéral, Hors Série IV (1998)
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