Guilleminite
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About Guilleminite
Formula:
Ba(UO2)3(SeO3)2(OH)4 · 3H2O
Colour:
Bright yellow
Lustre:
Waxy, Greasy, Dull, Earthy
Hardness:
2
Specific Gravity:
4.88
Crystal System:
Orthorhombic
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.
Classification of Guilleminite
Approved
4/K.11-30
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
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
34.7.3.1
34 : SELENITES, TELLURITES AND SULFITES
7 : Hydrated Selenites, Tellurites and Sulfites containing Hydroxyl or Halogen
34 : SELENITES, TELLURITES AND SULFITES
7 : Hydrated Selenites, Tellurites and Sulfites containing Hydroxyl or Halogen
28.1.9
28 : Selenites, Selenates, Tellurites, and Tellurates
1 : Selenites
28 : Selenites, Selenates, Tellurites, and Tellurates
1 : Selenites
Physical Properties of Guilleminite
Waxy, Greasy, Dull, Earthy
Transparency:
Translucent
Colour:
Bright yellow
Streak:
Light yellow
Hardness:
2 on Mohs scale
Hardness Data:
Estimated
Tenacity:
Brittle
Cleavage:
Perfect
{100} perfect, {010} good.
{100} perfect, {010} good.
Density:
4.88 g/cm3 (Measured) 5.08 g/cm3 (Calculated)
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
Max Birefringence:
δ = 0.085

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
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(UO2)3(SeO3)2(OH)4 · 3H2O
IMA Formula:
Ba(UO2)3(Se4+O3)2O2 · 3H2O
Crystallography of Guilleminite
Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Space Group:
Pmn21
Cell Parameters:
a = 7.29 Å, b = 16.87 Å, c = 7.07 Å
Ratio:
a:b:c = 0.432 : 1 : 0.419
Unit Cell V:
869.48 ų (Calculated from Unit Cell)
Z:
2
Comment:
Space group is P21nm
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
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
Type Occurrence of Guilleminite
General Appearance of Type Material:
selenian digenite
malachite
derricksite
marthozite
malachite
derricksite
marthozite
Geological Setting of Type Material:
Oxidized zone of a Uranium-Selenium-Copper deposit
Synonyms of Guilleminite
Other Language Names for Guilleminite
Common Associates
Associated Minerals Based on Photo Data:
Malachite | 14 photos of Guilleminite associated with Malachite on mindat.org. |
Vandenbrandeite | 13 photos of Guilleminite associated with Vandenbrandeite on mindat.org. |
Marthozite | 7 photos of Guilleminite associated with Marthozite on mindat.org. |
Cuprosklodowskite | 7 photos of Guilleminite associated with Cuprosklodowskite on mindat.org. |
Demesmaekerite | 6 photos of Guilleminite associated with Demesmaekerite on mindat.org. |
Wulfenite | 4 photos of Guilleminite associated with Wulfenite on mindat.org. |
Kasolite | 4 photos of Guilleminite associated with Kasolite on mindat.org. |
Torbernite | 4 photos of Guilleminite associated with Torbernite on mindat.org. |
Digenite | 2 photos of Guilleminite associated with Digenite on mindat.org. |
Chalcomenite | 1 photo of Guilleminite associated with Chalcomenite on mindat.org. |
Related Minerals - Nickel-Strunz Grouping
4.JJ.05 | Marthozite | Cu2+(UO2)3(SeO3)2O2 · 8H2O | Orth. |
4.JJ.15 | Piretite | Ca(UO2)3(SeO3)2(OH)4 · 4H2O | Orth. |
4.JJ.20 | Demesmaekerite | Pb2Cu5(UO2)2(SeO3)6(OH)6 · 2H2O | Tric. |
4.JJ.25 | Haynesite | (UO2)3(OH)2(SeO3)2 · 5H2O | Orth. |
Related Minerals - Hey's Chemical Index of Minerals Grouping
28.1.1 | Chalcomenite | CuSeO3 · 2H2O | Orth. 2 2 2 : P21 21 21 |
28.1.2 | Clinochalcomenite | CuSeO3 · 2H2O | Mon. |
28.1.3 | Francisite | Cu3Bi(SeO3)2O2Cl | Orth. mmm (2/m 2/m 2/m) : Pmmn |
28.1.4 | Sofiite | Zn2(SeO3)Cl2 | Orth. |
28.1.5 | Molybdomenite | PbSeO3 | Mon. |
28.1.6 | Haynesite | (UO2)3(OH)2(SeO3)2 · 5H2O | Orth. |
28.1.7 | Derriksite | Cu4(UO2)(SeO3)2(OH)6 | |
28.1.8 | Marthozite | Cu2+(UO2)3(SeO3)2O2 · 8H2O | Orth. |
28.1.10 | Demesmaekerite | Pb2Cu5(UO2)2(SeO3)6(OH)6 · 2H2O | Tric. |
28.1.11 | Mandarinoite | Fe3+2(Se4+O3)3 · (6-x)H2O (x = 0.0-1.0) | Mon. 2/m : P21/b |
28.1.12 | Cobaltomenite | CoSeO3 · 2H2O | Mon. |
28.1.13 | Ahlfeldite | Ni(SeO3) · 2H2O | Mon. 2/m |
Fluorescence of Guilleminite
Not fluorescent.
Other Information
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 Guilleminite
Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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
mindat.org URL:
https://www.mindat.org/min-1771.html
Please feel free to link to this page.
Please feel free to link to this page.
External Links:
Mineral Dealers:
Localities for Guilleminite
Locality List




All localities listed without proper references should be considered as questionable.
DR Congo | |
| M. Deliens |
| Bull.Soc.fr.Min.Crist. (1965) 88, 132-135.; Wilson, W.E. (2018) The Musonoi mine, Kolwezi District, Lualaba Province, Democratic Republic of the Congo. Mineralogical Record 49: 236-304.; http://www.champ-hannut.be/fichierpdf/Rev%20SP%202017%20NL.pdf |
France | |
| Le Règne Minéral, Hors Série IV (1998) |
Musonoi Mine, Kolwezi, Kolwezi District, Lualaba, DR Congo