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Compreignacite

A valid IMA mineral species
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About CompreignaciteHide

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 IdentifiersHide

Mindat ID:
1117
Long-form identifier:
mindat:1:1:1117:0
GUID
(UUID V4):
4b4daa39-f42d-4620-8ac8-a1c2813ca20c

IMA Classification of CompreignaciteHide

Classification of CompreignaciteHide

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
5.7.1.1

5 : OXIDES CONTAINING URANIUM OR THORIUM
7 : AX6O19·xH2O
7.16.8

7 : Oxides and Hydroxides
16 : Oxides of U

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
CgnIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of CompreignaciteHide

Sub-Vitreous, Resinous, Waxy, Greasy
Transparency:
Transparent, Translucent
Colour:
Yellow, orange-yellow
Streak:
Pale yellow
Tenacity:
Brittle
Cleavage:
Perfect
(001)
Density:
5.03(5) g/cm3 (Measured)    5.13(5) g/cm3 (Calculated)

Optical Data of CompreignaciteHide

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.
Surface Relief:
Very High
Dispersion:
r > v medium
Pleochroism:
Strong
Comments:
X(=c) colorless; Y(=a), Z(=b) yellow

Chemistry of CompreignaciteHide

Mindat Formula:
K2(UO2)6O4(OH)6 · 7H2O

Crystallography of CompreignaciteHide

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 StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0005561CompreignaciteBurns P C (1998) The structure of compreignacite, K2((UO2)3O2(OH)3)2(H2O)7 The Canadian Mineralogist 36 1061-106719980293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
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 EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 7: Great Oxidation Event<2.4
47a : [Near-surface hydration of prior minerals]
47f : [Uranyl (U⁶⁺) minerals]

Type Occurrence of CompreignaciteHide

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.
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 CompreignaciteHide

Other Language Names for CompreignaciteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
11 photos of Compreignacite associated with GypsumCaSO4 · 2H2O
5 photos of Compreignacite associated with PseudojohanniteCu3(OH)2[(UO2)4(SO4)2] · 12H2O
5 photos of Compreignacite associated with UraniniteUO2
4 photos of Compreignacite associated with UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
4 photos of Compreignacite associated with ZeuneriteCu(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 LeesiteK(H2O)2[(UO2)4O2(OH)5] · 3H2O
2 photos of Compreignacite associated with SklodowskiteMg(UO2)2(SiO3OH)2 · 6H2O
1 photo of Compreignacite associated with AgrinieriteK2(Ca,Sr)[(UO2)3O3(OH)2]2 · 5H2O

Related Minerals - Strunz-mindat GroupingHide

4.GB.05AgrinieriteK2(Ca,Sr)[(UO2)3O3(OH)2]2 · 5H2OMon. m : Bm
4.GB.05RameauiteK2Ca(UO2)6O6(OH)4 · 6H2OMon. m : Bb
4.GB.10BecquereliteCa(UO2)6O4(OH)6 · 8H2OOrth. mm2 : Pna21
4.GB.10BillietiteBa(UO2)6O4(OH)6 · 4-8H2OOrth. mm2
4.GB.10ProtasiteBa(UO2)3O3(OH)2 · 3H2OMon. m
4.GB.15Richetite(Fe3+,Mg)Pb 8.6(UO2)36O36(OH)24 · 41H2O Tric. 1 : P1
4.GB.20BauranoiteBa(UO2)2(OH)6 · 1-2H2O
4.GB.20Calciouranoite(Ca,Ba,Pb)U2O7 · 5H2O
4.GB.20Metacalciouranoite(Ca,Ba,Pb,K2)U2O7 · 2H2O
4.GB.25FourmarieritePb(UO2)4O3(OH)4 · 4H2OOrth. mm2
4.GB.30WölsendorfitePb7(UO2)14O19(OH)4 · 12H2OOrth. mmm (2/m 2/m 2/m) : Cmcm
4.GB.35MasuyitePb(UO2)3O3(OH)2 · 3H2OOrth. mmm (2/m 2/m 2/m)
4.GB.40MetavandendriesscheitePbU7O22 · nH2O n < 12Orth.
4.GB.40VandendriesscheitePbU7O22 · 12H2OOrth. mmm (2/m 2/m 2/m) : Pbca
4.GB.45VandenbrandeiteCu(UO2)(OH)4Tric. 1 : P1
4.GB.50SayritePb2(UO2)5O6(OH)2 · 4H2OMon. 2/m
4.GB.55CuritePb3(H2O)2[(UO2)4O4(OH)3]2Orth. mmm (2/m 2/m 2/m) : Pnma
4.GB.60Iriginite(UO2)Mo2O7 · 3H2OOrth. mmm (2/m 2/m 2/m) : Pbcm
4.GB.65UranosphaeriteBi(UO2)O2(OH)Mon. 2/m
4.GB.70HolfertiteCaxU6+2-xTi(O8-xOH4x) · 3H2OTrig. 3 : P3
4.GB.75Carlosbarbosaite(UO2)2Nb2O6(OH)2 · 2H2OOrth. mmm (2/m 2/m 2/m) : Cmcm
4.GB.80GauthieriteKPb[(UO2)7O5(OH)7] · 8H2OMon. 2/m : P21/b
4.GB.85KroupaiteKPb0.5[(UO2)8O4(OH)10] · 10H2OOrth. mmm (2/m 2/m 2/m) : Pbca
4.GB.90LeesiteK(H2O)2[(UO2)4O2(OH)5] · 3H2OOrth. mmm (2/m 2/m 2/m) : Pbca
4.GB.95ShinkolobweitePb1.25[U5+(H2O)2(U6+O2)5O8(OH)2](H2O)5Orth. mmm (2/m 2/m 2/m) : Pnnm
4.GB.95NollmotziteMg[U5+(U6+O2)2O4F3] · 4H2OMon. m : Bm

Fluorescence of CompreignaciteHide

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 InformationHide

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 CompreignaciteHide

References for CompreignaciteHide

Localities for CompreignaciteHide

This 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.

Locality ListHide

- 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.
Australia
 
  • Northern Territory
    • Coomalie Shire
      • Batchelor
        • Rum Jungle
Geosciences
  • Tasmania
    • Northern Midlands municipality
      • Rossarden mining district
Bottrill (2018)
Brazil
 
  • Bahia
Pires et al. (2014)
Czech Republic
 
  • Central Bohemian Region
Pauliš P. et al. (Kutna Hora, issue 1)
      • Příbram
        • Březové Hory
          • Březové Hory deposit
Plasil (2005)
  • Karlovy Vary Region
    • Karlovy Vary District
Lapis 2002 (7/8)
Möhn et al. (12/2021)
        • Rovnost Mine (Werner Mine)
Plášil et al. (2014)
        • Svornost Mine
Jiří Sejkora (2013)
    • Sokolov District
Pauliš P. et al. (Kutna Hora, issue 1)
70 (in German) +2 other references
  • Vysočina Region
    • Žďár nad Sázavou District
      • Nové Město na Moravě
Pauliš P. et al. (Kutna Hora, issue 1)
France (TL)
 
  • Nouvelle-Aquitaine
    • Haute-Vienne
      • Bellac
        • Compreignac
Bull.Soc.fr.Min.Crist. (1964)
  • Occitanie
    • Hérault
      • Lodève
        • Le Puech
Collection Frédéric Bonnet
        • Lodève
Collection Frédéric Bonnet
Germany
 
  • Baden-Württemberg
    • Freiburg Region
      • Waldshut
        • St Blasien
          • Menzenschwand
Lapis 21 (12)
  • Saxony
    • Erzgebirgskreis
      • Annaberg-Buchholz
        • Kleinrückerswalde
Desor (05/2020)
  • Thuringia
    • Greiz District
      • Kauern
Former Fritz Rüger collection
      • Ronneburg
T. Witzke & F. Rüger: Lapis 1998 (7/8)
Hungary
 
  • Baranya County
    • Pécs District
      • Kővágótöttös
Zsombor Eva
Italy
 
  • Lombardy
    • Sondrio Province
      • Novate Mezzola
        • Codera Valley
Ghizzoni et al. (2005)
Ghizzoni et al. (2005)
  • Sardinia
    • Metropolitan City of Cagliari
      • Capoterra
Olmi F.
Namibia
 
  • Hardap Region
    • Daweb
Bowell et al. (2017)
New Zealand
 
  • West Coast Region
XRD ID by BM (NH)
Slovakia
 
  • Košice Region
    • Spišská Nová Ves District
      • Hnilec
Martin Števko-unpublished
Spain
 
  • Catalonia
    • Lleida
      • El Pallars Jussà
        • La Vall Fosca
          • La Torre de Cabdella
            • Castell-estaó
MTI Mineralogía Topográfica Ibérica +1 other reference
Switzerland
 
  • Valais
    • Saint-Maurice
      • Finhaut
        • Emosson
Meisser (2012)
        • Giétroz
Meisser (2012)
      • Salvan
        • Les Marécottes
          • La Creusaz
N. Meisser +1 other reference
UK
 
  • England
    • Cornwall
      • St Just
        • Botallack
Elton et al. (1994) +1 other reference
Elton et al. (1994) +1 other reference
        • Pendeen
P Haas
USA
 
  • Colorado
    • Larimer County
      • Crystal Mountain Pegmatite Mining District (Storm Mountain Mining District)
Färber (n.d.)
www.seltene-mineralien.de (n.d.)
Eckel et al. (1997)
  • New Hampshire
    • Grafton County
      • Groton
Nashua Min. Soc. Disp. Cat. +1 other reference
  • Utah
    • Emery County
      • San Rafael Swell Mining District
Min News 14:7 p1
    • San Juan County
      • White Canyon Mining District
Min News 16:1 p1
 
Mineral and/or Locality  
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