Compreignacite
A valid IMA mineral species
This page is currently not sponsored. Click here to sponsor this page.
About Compreignacite
Formula:
K2(UO2)6O4(OH)6 · 7H2O
Colour:
Yellow, orange-yellow
Lustre:
Sub-Vitreous, Resinous, Waxy, Greasy
Specific Gravity:
5.03
Crystal System:
Orthorhombic
Name:
Named for the community of Compreignac, France, near the type locality.
Crystals tend to be small (< 1mm), platy, and translucent and occur on fracture surfaces with black uraninite. The color is yellow to orange-yellow and the luster grades from waxy to dull, rarely bright.
Unique Identifiers
Mindat ID:
1117
Long-form identifier:
mindat:1:1:1117:0
GUID
(UUID V4):
(UUID V4):
4b4daa39-f42d-4620-8ac8-a1c2813ca20c
IMA Classification of Compreignacite
Approved
First published:
1964
Classification of Compreignacite
4.GB.05
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
5.7.1.1
5 : OXIDES CONTAINING URANIUM OR THORIUM
7 : AX6O19·xH2O
5 : OXIDES CONTAINING URANIUM OR THORIUM
7 : AX6O19·xH2O
7.16.8
7 : Oxides and Hydroxides
16 : Oxides of U
7 : Oxides and Hydroxides
16 : Oxides of U
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 |
---|---|---|
Cgn | 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 Compreignacite
Sub-Vitreous, Resinous, Waxy, Greasy
Transparency:
Transparent, Translucent
Colour:
Yellow, orange-yellow
Streak:
Pale yellow
Tenacity:
Brittle
Cleavage:
Perfect
(001)
(001)
Density:
5.03(5) g/cm3 (Measured) 5.13(5) g/cm3 (Calculated)
Optical Data of Compreignacite
Type:
Biaxial (-)
RI values:
nα = 1.789 nβ = 1.798 nγ = 1.802
2V:
Measured: 10° to 15°
Birefringence:
0.013
Max Birefringence:
δ = 0.013
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 medium
Pleochroism:
Strong
Comments:
X(=c) colorless; Y(=a), Z(=b) yellow
Chemistry of Compreignacite
Mindat Formula:
K2(UO2)6O4(OH)6 · 7H2O
Elements listed:
Crystallography of Compreignacite
Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pnnm
Cell Parameters:
a = 7.161 Å, b = 12.190 Å, c = 14.847 Å
Ratio:
a:b:c = 0.587 : 1 : 1.218
Unit Cell V:
1,296.03 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Flattened on (001)
Twinning:
Common on (110)
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Show
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Display Options
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
View
CIF File Best | x | y | z | a | b | c
CIF File Best | x | y | z | a | b | c
Rotation
Stop | Start
Stop | Start
Labels
Console Off | On | Grey | Yellow
Console Off | On | Grey | Yellow
Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0005561 | Compreignacite | Burns P C (1998) The structure of compreignacite, K2((UO2)3O2(OH)3)2(H2O)7 The Canadian Mineralogist 36 1061-1067 | 1998 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
7.46 Å | (100) |
6.23 Å | (3) |
6.03 Å | (3) |
5.71 Å | (3) |
4.72 Å | (5) |
4.594 Å | (9) |
3.712 Å | (80) |
3.579 Å | (40) |
3.534 Å | (60) |
3.378 Å | (5) |
3.226 Å | (70) |
3.197 Å | (90) |
3.097 Å | (1) |
3.043 Å | (3) |
3.027 Å | (3) |
2.886 Å | (5) |
2.844 Å | (3) |
2.821 Å | (5) |
2.579 Å | (20) |
2.564 Å | (35) |
2.475 Å | (13) |
2.373 Å | (3) |
2.321 Å | (8) |
2.294 Å | (3) |
2.246 Å | (3) |
2.215 Å | (4) |
2.204 Å | (4) |
2.090 Å | (6) |
2.058 Å | (15) |
2.032 Å | (35) |
1.985 Å | (20) |
1.960 Å | (10) |
1.929 Å | (7) |
1.884 Å | (1) |
1.862 Å | (1) |
1.856 Å | (10) |
1.800 Å | (12) |
1.781 Å | (7) |
1.768 Å | (3) |
Comments:
ICDD 33-1049 Synthetic
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 7: Great Oxidation Event | <2.4 |
47a : [Near-surface hydration of prior minerals] | |
47f : [Uranyl (U⁶⁺) minerals] |
Type Occurrence of Compreignacite
Place of Conservation of Type Material:
University of Pierre and Marie Curie, Paris.
National School of Mines, Paris, France.
National Museum of Natural History (Smithsonian), Washington, D.C., USA, 165183.
National School of Mines, Paris, France.
National Museum of Natural History (Smithsonian), Washington, D.C., USA, 165183.
Associated Minerals at Type Locality:
Reference:
Protas, J. (1964) Une nouvelle espèce minérale: la compreinacite, K20·6UO3·11H2O. Bulletin de la Société française de minéralogie et de cristallographie: 87: 365-371.
Synonyms of Compreignacite
Other Language Names for Compreignacite
Common Associates
Associated Minerals Based on Photo Data:
11 photos of Compreignacite associated with Gypsum | CaSO4 · 2H2O |
5 photos of Compreignacite associated with Pseudojohannite | Cu3(OH)2[(UO2)4(SO4)2] · 12H2O |
5 photos of Compreignacite associated with Uraninite | UO2 |
4 photos of Compreignacite associated with Uranophane | Ca(UO2)2(SiO3OH)2 · 5H2O |
4 photos of Compreignacite associated with Zeunerite | Cu(UO2)2(AsO4)2 · 12H2O |
3 photos of Compreignacite associated with Schoepite | (UO2)8O2(OH)12 · 12H2O |
2 photos of Compreignacite associated with Rutherfordine | (UO2)CO3 |
2 photos of Compreignacite associated with Leesite | K(H2O)2[(UO2)4O2(OH)5] · 3H2O |
2 photos of Compreignacite associated with Sklodowskite | Mg(UO2)2(SiO3OH)2 · 6H2O |
1 photo of Compreignacite associated with Agrinierite | K2(Ca,Sr)[(UO2)3O3(OH)2]2 · 5H2O |
Related Minerals - Strunz-mindat Grouping
4.GB.05 | Agrinierite | K2(Ca,Sr)[(UO2)3O3(OH)2]2 · 5H2O |
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.80 | Gauthierite | KPb[(UO2)7O5(OH)7] · 8H2O |
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 Compreignacite
Weakly fluorescent green in SWUV. Slightly brighter green fluorescence in LWUV. Distinctive green (not yellow-green) fluorescence in both SW-LED and LW-LED.
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 Compreignacite
mindat.org URL:
https://www.mindat.org/min-1117.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
References for Compreignacite
Reference List:
Protas, Jean (1964) Une nouvelle espèce minérale : la compreignacite, K2O·6UO3·11H2O. Bulletin de Minéralogie, 87 (3) 365-371 doi:10.3406/bulmi.1964.5750
Burns, P. C. (1998) The structure of compreignacite, K2[(UO2)3O2(OH)3]2(H2O)7. The Canadian Mineralogist, 36 (4) 1061-1067
Burns, Peter C. (2005) U6+ minerals and inorganic compounds: insights into an expanded structural hierarchy of crystal structures. The Canadian Mineralogist, 43 (6) 1839-1894 doi:10.2113/gscanmin.43.6.1839
Localities for Compreignacite
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.
Australia | |
| Geosciences |
| Bottrill (2018) |
Brazil | |
| Pires et al. (2014) |
Czech Republic | |
| Pauliš P. et al. (Kutna Hora, issue 1) |
| Plasil (2005) |
| Lapis 2002 (7/8) |
Möhn et al. (12/2021) | |
| Plášil et al. (2014) |
| Jiří Sejkora (2013) |
| Pauliš P. et al. (Kutna Hora, issue 1) |
70 (in German) +2 other references | |
| Pauliš P. et al. (Kutna Hora, issue 1) |
France (TL) | |
| Bull.Soc.fr.Min.Crist. (1964) |
| Collection Frédéric Bonnet |
| Collection Frédéric Bonnet |
Germany | |
| Lapis 21 (12) |
| Desor (05/2020) |
| Former Fritz Rüger collection |
| T. Witzke & F. Rüger: Lapis 1998 (7/8) |
Hungary | |
| Zsombor Eva |
Italy | |
| Ghizzoni et al. (2005) |
Ghizzoni et al. (2005) | |
| Olmi F. |
Namibia | |
| Bowell et al. (2017) |
New Zealand | |
| XRD ID by BM (NH) |
Slovakia | |
| Martin Števko-unpublished |
Spain | |
| MTI Mineralogía Topográfica Ibérica +1 other reference |
Switzerland | |
| Meisser (2012) |
| Meisser (2012) |
| N. Meisser +1 other reference |
UK | |
| Elton et al. (1994) +1 other reference |
Elton et al. (1994) +1 other reference | |
| P Haas |
USA | |
| Färber (n.d.) |
www.seltene-mineralien.de (n.d.) | |
Eckel et al. (1997) | |
| Nashua Min. Soc. Disp. Cat. +1 other reference |
| Min News 14:7 p1 |
| Min News 16:1 p1 |
Quick NavTopAbout CompreignaciteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesCommon AssociatesStrunz-MindatFluorescence Other InformationInternet Links References Localities Locality List
Giftkies adit, Jáchymov, Karlovy Vary District, Karlovy Vary Region, Czech Republic