Gauthierite
A valid IMA mineral species
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About Gauthierite
Formula:
KPb[(UO2)7O5(OH)7] · 8H2O
Colour:
yellowish-orange
Lustre:
Vitreous
Hardness:
3 - 4
Specific Gravity:
5.437 (Calculated)
Crystal System:
Monoclinic
Name:
Named in honour of Gilbert Joseph Gauthier (24 December 1924 - 23 June 2006), Belgian geological engineer, collector of uranium minerals.
Unique Identifiers
Mindat ID:
47788
Long-form identifier:
mindat:1:1:47788:2
GUID
(UUID V4):
(UUID V4):
4a37e96e-2b0a-4781-8c72-290dd397c1db
IMA Classification of Gauthierite
Approved
Approval year:
2016
First published:
2017
Type description reference:
Olds, Travis A., Plášil, Jakub, Kampf, Anthony R., Škoda, Radek, Burns, Peter C., Čejka, Jiří, Bourgoin, Vincent, Boulliard, Jean-Claude (2017) Gauthierite, KPb[(UO2)7O5(OH)7]·H2O, a new uranyl-oxide hydroxy-hydrate mineral from Shinkolobwe with a novel uranyl-anion sheet-topology. European Journal of Mineralogy, 29 (1) 129-141 doi:10.1127/ejm/2017/0029-2586
Classification of Gauthierite
4.GB.80
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
G : Uranyl Hydroxides
B : With additional cations (K, Ca, Ba, Pb, etc.); with mainly UO2(O,OH)5 pentagonal polyhedra
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
G : Uranyl Hydroxides
B : With additional cations (K, Ca, Ba, Pb, etc.); with mainly UO2(O,OH)5 pentagonal polyhedra
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Gut | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Gauthierite
Vitreous
Transparency:
Transparent
Colour:
yellowish-orange
Streak:
pale orange
Hardness:
3 - 4 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
(010)
(010)
Fracture:
Irregular/Uneven
Density:
5.437 g/cm3 (Calculated)
Optical Data of Gauthierite
Type:
Biaxial (-)
RI values:
nα = 1.780(5) nβ = 1.815(5) nγ = 1.825(5)
2V:
Measured: 58° (1), Calculated: 55.4°
Max Birefringence:
δ = 0.045
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:
extreme r>>v
Pleochroism:
Visible
Comments:
X=very pale yellow, Y=Z= orange-yellow
Chemistry of Gauthierite
Mindat Formula:
KPb[(UO2)7O5(OH)7] · 8H2O
Crystallography of Gauthierite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/c
Cell Parameters:
b = 14.5368(8) Å, c = 14.0406(7) Å
β = 103.708(6)°
β = 103.708(6)°
Ratio:
a:b:c = 1 : 0.966
Unit Cell V:
5917.8 ų
Z:
8
Twinning:
None
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
7.28 Å | (49) |
3.566 Å | (67) |
3.192 Å | (100) |
2.541 Å | (18) |
2.043 Å | (14) |
2.001 Å | (23) |
1.962 Å | (14) |
1.783 Å | (17) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Near-surface Processes | |
27 : Radioactive decay; auto-oxidation | |
Stage 7: Great Oxidation Event | <2.4 |
47a : [Near-surface hydration of prior minerals] | |
47g : [Halogen-bearing surface weathering minerals] |
Type Occurrence of Gauthierite
Place of Conservation of Type Material:
Mineralogical collections of the Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA (catalogue number 65644)
Associated Minerals at Type Locality:
Reference:
Olds, T.A., Plášil, J., Kampf, A.R., Škoda, R., Burns, P.C., Čejka, J., Bourgoin, V., Boulliard, J.-C. (2017): Gauthierite, KPb[(UO2)7O5(OH)7].8H2O, a new uranyl-oxide hydroxy-hydrate mineral from Shinkolobwe with a novel uranyl-anion sheet-topology. European Journal of Mineralogy, 29, 129-141.
Synonyms of Gauthierite
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
4.GB.05 | Agrinierite | K2(Ca,Sr)[(UO2)3O3(OH)2]2 · 5H2O |
4.GB.05 | Compreignacite | K2(UO2)6O4(OH)6 · 7H2O |
4.GB.05 | Rameauite | K2Ca(UO2)6O6(OH)4 · 6H2O |
4.GB.10 | Becquerelite | Ca(UO2)6O4(OH)6 · 8H2O |
4.GB.10 | Billietite | Ba(UO2)6O4(OH)6 · 4-8H2O |
4.GB.10 | Protasite | Ba(UO2)3O3(OH)2 · 3H2O |
4.GB.15 | Richetite | (Fe3+,Mg)Pb 8.6(UO2)36O36(OH)24 · 41H2O |
4.GB.20 | Bauranoite | Ba(UO2)2(OH)6 · 1-2H2O |
4.GB.20 | Calciouranoite | (Ca,Ba,Pb)U2O7 · 5H2O |
4.GB.20 | Metacalciouranoite | (Ca,Ba,Pb,K2)U2O7 · 2H2O |
4.GB.25 | Fourmarierite | Pb(UO2)4O3(OH)4 · 4H2O |
4.GB.30 | Wölsendorfite | Pb7(UO2)14O19(OH)4 · 12H2O |
4.GB.35 | Masuyite | Pb(UO2)3O3(OH)2 · 3H2O |
4.GB.40 | Metavandendriesscheite | PbU7O22 · nH2O n < 12 |
4.GB.40 | Vandendriesscheite | PbU7O22 · 12H2O |
4.GB.45 | Vandenbrandeite | Cu(UO2)(OH)4 |
4.GB.50 | Sayrite | Pb2(UO2)5O6(OH)2 · 4H2O |
4.GB.55 | Curite | Pb3(H2O)2[(UO2)4O4(OH)3]2 |
4.GB.60 | Iriginite | (UO2)Mo2O7 · 3H2O |
4.GB.65 | Uranosphaerite | Bi(UO2)O2(OH) |
4.GB.70 | Holfertite | CaxU6+2-xTi(O8-xOH4x) · 3H2O |
4.GB.75 | Carlosbarbosaite | (UO2)2Nb2O6(OH)2 · 2H2O |
4.GB.85 | Kroupaite | KPb0.5[(UO2)8O4(OH)10] · 10H2O |
4.GB.90 | Leesite | K(H2O)2[(UO2)4O2(OH)5] · 3H2O |
4.GB.95 | Shinkolobweite | Pb1.25[U5+(H2O)2(U6+O2)5O8(OH)2](H2O)5 |
4.GB.95 | Nollmotzite | Mg[U5+(U6+O2)2O4F3] · 4H2O |
Fluorescence of Gauthierite
None
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.
Internet Links for Gauthierite
mindat.org URL:
https://www.mindat.org/min-47788.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
Mineral Dealers:
References for Gauthierite
Reference List:
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2016) New minerals and nomenclature modifications approved in 2016, CNMNC Newsletter no 31. Mineralogical Magazine, 80 (4) 691-697 doi:10.1180/minmag.2016.080.083
Olds, Travis A., Plášil, Jakub, Kampf, Anthony R., Škoda, Radek, Burns, Peter C., Čejka, Jiří, Bourgoin, Vincent, Boulliard, Jean-Claude (2017) Gauthierite, KPb[(UO2)7O5(OH)7]·H2O, a new uranyl-oxide hydroxy-hydrate mineral from Shinkolobwe with a novel uranyl-anion sheet-topology. European Journal of Mineralogy, 29 (1) 129-141 doi:10.1127/ejm/2017/0029-2586
Localities for Gauthierite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
DR Congo (TL) | |
| Hålenius et al. (2016) +1 other reference |
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Shinkolobwe Mine, Shinkolobwe, Kambove Territory, Haut-Katanga, DR Congo