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Compreignacite

Formula:
K
 
2
(UO
 
2
)
 
6
O
 
4
(OH)
 
6
· 7H
 
2
O
System:Orthorhombic
This page provides mineralogical data about Compreignacite.

Classification of Compreignacite

IMA status:Approved
Strunz 8th edition ID:4/H.03-10
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:5.7.1.1

5 : OXIDES CONTAINING URANIUM OR THORIUM
7 : AX6O19·xH2O
Hey's CIM Ref.:7.16.8

7 : Oxides and Hydroxides
16 : Oxides of U
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Type Occurrence of Compreignacite

Type Locality:Margnac Mine, Compreignac, Haute-Vienne, Limousin, France
Year of Discovery:1964

Crystallography of Compreignacite

Crystal System:Orthorhombic
Cell Parameters:a = 7.16Å, b = 12.14Å, c = 14.88Å
Ratio:a:b:c = 0.59 : 1 : 1.226
Unit Cell Volume:V 1,293.41 ų (Calculated from Unit Cell)

Optical Data of Compreignacite

Type:Biaxial (-)
Dispersion:r > v medium

Chemical Properties of Compreignacite

Formula:
K
 
2
(UO
 
2
)
 
6
O
 
4
(OH)
 
6
· 7H
 
2
O
Essential elements:H, K, O, U
All elements listed in formula:H, K, O, U

Relationship of Compreignacite to other Species

Related Minerals - Nickel-Strunz Grouping):
4.GB.05Agrinierite
K
 
2
(Ca,Sr)(UO
 
2
)
 
3
O
 
3
(OH)
 
2
· 5H
 
2
O
4.GB.05Rameauite
K
 
2
Ca(UO
 
2
)
 
6
(OH)
 
16
· H
 
2
O
4.GB.10Becquerelite
Ca(UO
 
2
)
 
6
O
 
4
(OH)
 
6
· 8H
 
2
O
4.GB.10Billietite
Ba(UO
 
2
)
 
6
O
 
4
(OH)
 
6
· 4-8H
 
2
O
4.GB.10Protasite
Ba(UO
 
2
)
 
3
O
 
3
(OH)
 
2
· 3H
 
2
O
4.GB.15Richetite
PbU
 
4
O
 
13
·4H
 
2
O
4.GB.20Bauranoite
Ba(UO
 
2
)
 
2
(OH)
 
6
· 1-2H
 
2
O
4.GB.20Calciouranoite
(Ca,Ba,Pb)U
 
2
O
 
7
·5H
 
2
O
4.GB.20Metacalciouranoite
(Ca,Ba,Na
 
2
)U
 
2
O
 
7
·2H
 
2
O
4.GB.25Fourmarierite
PbU
 
4
O
 
13
·4H
 
2
O
4.GB.30Wölsendorfite
(Pb,Ca)U
 
2
O
 
7
·2H
 
2
O
4.GB.35Masuyite
Pb(UO
 
2
)
 
3
O
 
3
(OH)
 
2
· 3H
 
2
O
4.GB.40Metavandendriesscheite
PbU
 
7
O
 
22
·nH
 
2
O n < 12
4.GB.40Vandendriesscheite
PbU
 
7
O
 
22
·12H
 
2
O
4.GB.45Vandenbrandeite
Cu(UO
 
2
)(OH)
 
4
4.GB.50Sayrite
Pb
 
2
(UO
 
2
)
 
5
O
 
6
(OH)
 
2
·4H
 
2
O
4.GB.55Curite
Pb
 
3
(UO
 
2
)
 
8
O
 
8
(OH)
 
6
·2H
 
2
O
4.GB.60Iriginite
UO
 
2
Mo
 
2
O
 
7
·3H
 
2
O
4.GB.65Uranosphaerite
Bi(UO
 
2
)O
 
2
(OH)
4.GB.70Holfertite
Ca
 
x
U
6+
2-x
Ti(O
 
8-x
OH
 
4x
) · 3H
 
2
O
Related Minerals - Hey's Index Grouping:
7.16.1Uraninite
UO
 
2
7.16.2Schoepite
(UO
 
2
)
 
8
O
 
2
(OH)
 
12
· 12H
 
2
O
7.16.3Paraschoepite
UO
 
3
· 2H
 
2
O
7.16.4Metaschoepite
UO
 
3
· 1-2H
 
2
O
7.16.5Metastudtite
UO
 
4
· 2H
 
2
O
7.16.6Studtite
UO
 
4
· 4H
 
2
O
7.16.7Ianthinite
U
4+
 
(UO
 
2
)
 
5
O
 
7
· 10H
 
2
O
7.16.9Vandenbrandeite
Cu(UO
 
2
)(OH)
 
4
7.16.10Roubaultite
Cu
 
2
(UO
 
2
)
 
3
(OH)
 
10
· 5H
 
2
O
7.16.11Becquerelite
Ca(UO
 
2
)
 
6
O
 
4
(OH)
 
6
· 8H
 
2
O
7.16.12Rameauite
K
 
2
Ca(UO
 
2
)
 
6
(OH)
 
16
· H
 
2
O
7.16.13Agrinierite
K
 
2
(Ca,Sr)(UO
 
2
)
 
3
O
 
3
(OH)
 
2
· 5H
 
2
O
7.16.14Protasite
Ba(UO
 
2
)
 
3
O
 
3
(OH)
 
2
· 3H
 
2
O
7.16.15Billietite
Ba(UO
 
2
)
 
6
O
 
4
(OH)
 
6
· 4-8H
 
2
O
7.16.16Bauranoite
Ba(UO
 
2
)
 
2
(OH)
 
6
· 1-2H
 
2
O
7.16.17Metacalciouranoite
(Ca,Ba,Na
 
2
)U
 
2
O
 
7
·2H
 
2
O
7.16.18Calciouranoite
(Ca,Ba,Pb)U
 
2
O
 
7
·5H
 
2
O
7.16.19Orthobrannerite
UTi
 
4
O
 
12
(OH)
 
2
7.16.20Thorutite
(Th,U,Ca)Ti
 
2
(O,OH)
 
6
7.16.21Davidite-(La)
(La,Ce)(Y,U,Fe)(Ti,Fe)
 
20
(O,OH)
 
38
7.16.22Davidite-(Ce)
(Ce,La)(Y,U,Fe)(Ti,Fe)
 
20
(O,OH)
 
38
7.16.23Brannerite
(U
4+
 
,Ca)(Ti,Fe
3+
 
)
 
2
O
 
6
7.16.24Fourmarierite
PbU
 
4
O
 
13
·4H
 
2
O
7.16.25Richetite
PbU
 
4
O
 
13
·4H
 
2
O
7.16.26Curite
Pb
 
3
(UO
 
2
)
 
8
O
 
8
(OH)
 
6
·2H
 
2
O
7.16.27Masuyite
Pb(UO
 
2
)
 
3
O
 
3
(OH)
 
2
· 3H
 
2
O
7.16.28Vandendriesscheite
PbU
 
7
O
 
22
·12H
 
2
O
7.16.29Metavandendriesscheite
PbU
 
7
O
 
22
·nH
 
2
O n < 12
7.16.30Sayrite
Pb
 
2
(UO
 
2
)
 
5
O
 
6
(OH)
 
2
·4H
 
2
O
7.16.31Wölsendorfite
(Pb,Ca)U
 
2
O
 
7
·2H
 
2
O
7.16.32Clarkeite
(Na,Ca,Pb)
 
2
U
 
2
(O,OH)
 
7
7.16.33Uranosphaerite
Bi(UO
 
2
)O
 
2
(OH)

Other Names for Compreignacite

Synonyms:
IMA1964-026
German names:
Compreignacit
Russian names:
Компреньясит
Spanish names:
Compreignacita

Other Information

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 Compreignacite

Reference List:American Mineralogist: 50: 807.

Burns, P.C. (1998), The structure of compreignacite, K2[(UO2)3O2(OH)3]2(H2O)7: Canadian Mineralogist: 36: 1061-1067.

Hill, F.C. and Burns, P.C. (1999) Structure of a synthetic Cs uranyl oxide hydrate and its relationship to compreignacite. Canadian Mineralogist: 37: 1283-1288.

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 Compreignacite

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  • American Mineralogist Crystal Structure Database
  • Search for Compreignacite in the Natural History Museum (London) online catalogue
  • Compreignacite details from Handbook of Mineralogy (PDF)
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    Localities for Compreignacite

    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.
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    (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.
    Czech Republic
     
    • Bohemia (Böhmen; Boehmen)
      • Karlovy Vary Region
        • Krušné Hory Mts (Erzgebirge)
          • Ostrov
    Lapis 2002(7/8), 63-65
    France
     
    • Limousin
      • Haute-Vienne
        • Compreignac
    Bull.Soc.fr.Min.Crist.(1964) 87, 365-371
    Germany
     
    • Baden-Württemberg
      • Black Forest
        • Menzenschwand
    Lapis 21(12), 45 (1996)
    • Thuringia
      • Gera
        • Ronneburg U deposit
    T. Witzke & F. Rüger: Lapis 1998(7/8), 26-64
    Italy
     
    • Lombardy
      • Sondrio Province
        • Novate Mezzola
          • Codera Valley
    Ghizzoni, S. & Mazzoleni, G. (2005): Itinerari mineralogici in val Codera. Geologia Insubrica, Ed., Milano, 316 pp.
    Ghizzoni, S. & Mazzoleni, G. (2005): Itinerari mineralogici in val Codera. Geologia Insubrica, Ed., Milano, 316 pp.
    • Sardinia
      • Cagliari Province
        • Capoterra
    Olmi F., Sabelli C., Senesi F., Stara P., 2002. La mineralizzazione uranifera di Arcu su Linnarbu. Riv. Miner. Ital., 3: 148-169.
    Switzerland
     
    • Wallis (Valais)
      • Le Trient Valley
        • Les Marécottes
    UK
     
    • England
      • Cornwall
        • St Just District
          • Botallack - Pendeen Area
            • Botallack
    No reference listed
            • Pendeen
    C McLary collection, St Just
            • Truthwall
    [Golley & Williams, 1995, "Cornish Mineral Reference Manual", 18]
    USA
     
    • Colorado
      • Saguache Co.
    Minerals of Colorado (1997) Eckels, E. B.
    • New Hampshire
      • Grafton Co.
        • Groton
    Nashua Min. Soc. Disp. Cat., 1995
    • Utah
      • Emery Co.
        • San Rafael District (San Rafael Swell)
          • Delta
    Min News 14:7 p1
      • San Juan Co.
        • White Canyon District
          • White Canyon
    Min News 16:1 p1
    Mineral and/or Locality
    Google
     
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